Anyone heard of this?

http://www.leaptrade.com/

Basically one big game exchange site. You look up the game you want to sell/trade and exchange it for LeapTrade credit which can be used to purchase other games on the site, or exchange it for another game. Only thing you have to pay (if you're the one selling) is shipping which is around the three dollars mark. Not a bad resource for getting games. Learned what some of the games I'm looking to sell are worth, too.