I walked in to my local Gamestop today, just to see what titltes are out there.  It seems Gamestop has a nice deal, where if you buy two used games(or dvds) you get a third one free!  This deal is quite good, in fact!  The game that is free will of course be the cheapest one though.  Why don't you use this oppurtunity to pick up some sports games, or some games to hold you off until the next great hit comes out for the PSP?  Anyways, check it out, and save yourself some money!

I am not positive if this offer exists in all Gamestops, but the majority, should be having the same deal going on right now.