This is a great app

Yes you can find affordable things that people sell. It’s very worth it. I really recommend it especially when family is in tight budget. The plus is you can always search in your area to find an item.

Application

Have you heard of the app called "Letgo "
I just got to know about it and liking it a lot. It's an app that you can use to sell stuff instantly.
It is free and very convenient to use.
You can only do cash transaction on it. Be sure, to exchange at public places and be safe. :)