Mercari is an app where you can sell and buy things. There are great prices on products new and used. It is easy to use whether you want to sell or buy things. If you want to sell they charge a 10% fee.
To get an item completely free you need to list four things to sell. Right after you list four items you can place your free order. They have a lot of categories to choose from. I see they have things that are priced up to $20. Not a bad deal for listing things and making money from them. Also, you can get a $10 coupon off your first purchase when you sign up using my link.