Swaptree allows users to swap media items (books, CDs, DVDs and video games) with other users without the use of cash. Swaptree will not charge a transaction fee, relying instead on contextual advertising revenue that will be placed on the site. For a new user, the idea is that you type in a few items that you own and are willing to trade (using the UPC or ISBN code) and you’ll see thousands or tens of thousands of items that people are willing to trade for your stuff.

Is it really free? Yep.  It really is.

They don’t charge you for listing items or trading items. Nothing.  Nada.  Nil. Your only expense is paying the shipping of your item.  Use the post office’s Media Mail service and you can send almost everything for less than $2.50.  Better yet, if you want, we’ll try to find a trade for you with a swaptree member right down the street, or with one of your friends or co-workers, so you can just forget about postage and hand your item over in person.  Now you aren’t paying a dime!