Are there things in your house that you don’t use anymore? Why not auction, trade, or sell them on sites like Offerup? Not only that, but you can also buy items on the platforms.
Offerup is a customer-to-customer platform where you can buy and sell second-hand goods. It is differentiated from other second-hand buying and selling platforms through its mobile-friendly app, great user profiles, and ratings.
You need to create a profile, upload a good photo, add a description, and start selling. If you want to buy, ensure you scrutinize the items well till you find the most ideal for your needs.
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1. Letgo
Just as its name suggests, Letgo is a platform you can use to buy and sell your second-hand items. These include vehicles, electronics, clothing, and much more. Take advantage of the platform and sell your old items to the right customers at your preferred price.
While selling, you can also purchase stuff from Letgo and fill up your space. It is free to create an account; what are you waiting for? Even if you aren't a tech person, you won't find it hard to post an item. You need to snap a beautiful photo, provide a good description, and set the right price.
However, before making purchases ensure you meet in a public place with the seller, don't give your financial information, check the seller's profile and ratings.
Click to Download Letgo: 
2. Listia
The Listia platform allows you to check millions of items, buy, sell or trade and gain points. The points can then be used as gift cards to buy anything on the platform. You get to sell things you don't want and get the stuff you want for free.
The categories include jewelry, electronics, clothes, books, toys, games, gift cards, and much more. It's as simple as selling, getting points, and buying stuff using your points. To sell, take a good photo, provide details, and list the platform. People will bid on it, and you can bid on other items.
Click to Download Listia:
3. Mercari
This Mercari platform lets you get rid of and gain other stuff. You can easily exchange stuff at your comfort effortlessly. The platform offers pickups, same-day delivery, and a variety of item categories. Once your item gets sold, contact your local carrier, who picks it up and delivers it to the buyer.
To sell, you need to take a good photo of the item, add a description, and list the item. It is free to list an item; you only get charged when the sale is complete. The payment is made through Instant pay after verification of your ID.
Mercari takes charge of shipping and delivering the items. So, no issue for you! There are many brands on the platform, don’t be left out! All the kinds of items you would want are readily available.
Click to Download Mercari:
4. eBay
eBay allows you to buy and sell items on the platform. On the platform, you can see app-exclusive offers and online shopping deals. As a seller, you can easily track your online shopping orders in real-time.
The checkout system is also easy to reduce instances of customers abandoning the cart. It is also easy to list items you want to sell in minutes.
There are different categories, such as books, electronics, watches, handbags, shoes, clothing, laptops, portable audio, and much more. There are great deals that you can lavish on. All you need under one roof!
Click to Download eBay:
5. Oodle
Oddle is a great marketplace where you can buy and sell items. Do you have items that you don't normally use? Then, why not put a listing on the site! You can sell clothes, cars, boats, pets, tickets, services, personals, jobs, and houses.
Everything you can think of can be posted on the site. On the site, you need to provide a picture of the items and a description of the items. It's an online classified site that gets over 15million new visitors each month. Hence, be assured that your goods will be gotten easily.
Click to Download Oddle: 
6. Poshmark
Poshmark is a great social eCommerce marketplace for inhabitants of the US, Canada, and Australia. You can sell and buy new or used attires, shoes, accessories, sneakers, and much more. To sell, you will need to take a good photo of the item and upload it on the site.
After that, you can then share the listing to get more customers. Once the item is bought, the management ships it to your customer, and you get cash when the item is delivered. On the platform, you are assured of payment protection, easy shipping, and free authentication for luxurious items.
While buying, be ready to get items with discounted prices, get personalized recommendations, and get your item fast. Don't let your closet be packed up with items you don't use anymore.
Click to Download Poshmark:
7. Craigslist
Craiglist is a classified ad website that allows you to buy and sell items. It has been in existence since 1995 and has grown to be better with time. You can post jobs, offer services, sell cars, furniture, electronics, household items, clothing, and much more.
Even as an artist, you can schedule events and sell tickets on the platform. You can post, edit and renew your ads as you wish. If you want to promote your business products, this is the best platform to sell your items. Try it out today!
Click to Download Craiglist:
8. TradeMade
The platform allows you to trade items and services effortlessly. There are many people out there who are ready to purchase your items. Trade made is a great trade and barter app for all your items. Like most platforms, you need to take a good photo of the item, upload it on the site, and provide a proper description.
You can use the filters to narrow the search, such as location, value range, and categories. You can propose a trade with any combination of items according to your needs. The platform also allows you to accept, reject, or countertrade things you have sent and received.
You can even trade a shoe for an event ticket. It depends on your wants. You can trade like three items for two and so on. Also, whenever you trade, you help support environmental conservation. If your trade is accepted, and you accept a received trade, that is a trade made!
Click to Download TradeMade:
9. Recycler
It has a simple-to-use interface to ensure you don't get lost while buying or selling items. On the dashboard, you can see the date and content of your next collection.
The collection points are available for the different types of items, electronics, second-hand clothes, glass domes, and recycling parks. You also get to see the opening and closing hours. You can also opt to be getting customized notifications.
Click to Download Recycler:
10. Etsy
Etsy is a great eCommerce company that focuses on the buying and selling handmade or vintage items. The items fall under various categories such as jewelry, bags, clothing, home décor, toys, household, electronics, and other tools. In the case of vintage items, they need to be at least 20 years old.
The Etsy app and website allow you to shop and sell items at your comfort. There are handmade goods, vintage goods, creative goods, and custom goods. You can explore all the unique items, save your favorite items, and discover more later. Also, get notified when new items in your selected category are added. You can also chat directly with shop owners.
Click to Download Etsy:
11. VarageSale
Buying and selling items have never been easier. In VarageSale, you can enter your location and join a community in a place near where you live or work. You then get verified through Facebook. The administrator will review your request for approval. Once approved, you can now buy and sell safely.
The manual verification helps to enhance the security of the platform. You also get to see seller ratings to determine their credibility. Easily browse local listings or filter the categories. You need to upload a photo, add the details, and list the item.
Click to Download VarageSale:
12. Decluttr
The platform allows you to recycle phones, CDs, DVDs, books, and much more. Just name it! To sell, you need to scan your CDs, DVDs, Games, and books using your device's camera. Ultimately, choose any shipping items and get paid the day the items arrive.
Decluttr then takes the role of selling your items. The platform lets you get an instant valuation of your old tech offers fast payments, and free shipping. Get rid of your old things in the most environmentally friendly way. You can get paid through direct deposit or PayPal.
Click to Download Decluttr:
13. 5Miles
Have you ever heard of 5miles? It is a platform where you can buy, sell and auction goods. On the auctioned goods, you can bid on brand new items. The auctions last up to 90 seconds, with the bids starting at $1. You should only pay when you win, and the items are shipped to your door.
If you decide to buy an item and get dissatisfied, you can request a refund. As a seller, you need to snap a photo of your items and add your listing with the required details. To make an offer, you will need to send an app chat message.
The platform ensures email, phone, or Facebook verification. You will get great stuff from the platform and even filter to get the relevant listing. It is like having your online garage sale.
Click to Download 5miles:
14. Geebo
Geebo is a great online classified marketplace for promoting job listing and other services. You can get different merchandise, construction equipment, vehicles, services, employment, rentals, real estate, and jobs. Everything that you can think of.
You need to take a photo of your item, write a description and put your price. It is easy to buy and sell on the platform.
Click to Download Geebo:
15. Locanto
Locanto is a great platform that you can use to make money on things that you no longer need. You can sell everything you don't need, post an ad or browse hundreds of categories of things. You can narrow it down and see who is selling goods near you.
Furthermore, you can also live chat to get answers from various sellers. In addition, you can sign up to be getting alerts on your phone. If you opt to sell items, you can share the post on social media for others to see.
Not only can you sell products, but also advertise your services, an event, or a job. Take a picture of what you want to advertise, offer a description, and your listing will be online.
Click to Download Locanto:
16. Bookoo
This platform allows you to sell and buy stuff with your neighbors. It is a friendly community yard sale. You get to post, chat, meet, and buy the item.
You can sell clothes, toys, furniture, households, electronics, shoes, and much more. This will ensure that you clear your house and leave room for new items. As a seller, you need to list your item and wait for a buyer. As a buyer, you can contact the seller, meet up, and exchange stuff.
Click to Download Bookoo:
17. Facebook Marketplace
This is a great platform where you can buy and sells items. As a seller, you need to take a photo, add a description, and wait for buyers to get your items.
As a buyer, you will be presented with different items and contact the seller if you require a certain item. However, to use it, it is important to have a Facebook account. It is a great platform that you can use to increase your reach.
Click to Download Facebook:
18. GumTree
This is a British-based online classified advertisement platform. The classified ads are either free or paid, depending on the product category. Items are bought and sold every day.
You can trade both new and used items on the platform. You can sell clothes, shoes, games, cars, electronics, furniture, and other items.
Over 14 million people a month use Gumtree to browse, buy, and sell items. You need to create an ad, write a description, and communicate with your buyers.
Click to Download GumTree:
Buy And Sell From Your Comfort
Buying and selling goods have never been easier. You can use any of these platforms to sell stuff that you ain’t using anymore. This will also help to create space in your house. You can then buy items that you need more. In some cases, you trade items for others, hence you won’t have to dig into your pockets.