Bibliomania

OK so if you're going to bibliomania the chances are pretty high that you homeschool or absolutely love used books and resources. This is a buy, sell, trade bookstore but they are specific in what they except. You set up an account and when your item sells they give you the money so it's not immediate but they do offer cash unlike Gardner's used bookstore.
If Piles of books around your feet make you antsy then don't enter. It is very organized though, they have a HUGE abundance of merchandise. If you love the hunt/search/find then you will love bibliomania. It's especially good for finding classics and award winning children's books, history and Manipulatives. Huge educational resource and curriculum store