toys r us is currently doing a buy 2 get 1 free.

 Yeah, I saw that but not everything I want is on there and I'm not buying a game I'm sort of interested in because it is part of a bundle...

Here's why I go used and love the 3:2 when GS/EB games runs it:

54.99 for new releases (360) minus 10% from having a member card means I pay $50 for new releases (used, of course).

I get 3 games for $100 or $33 each.  As long as the resale value holds (and it generally does for a handful of months on top-rated games), I'll get $20-25 trading in plus 10% (member card).  In the end I spend less than 10 bucks each to "rent" them and play at my leisure.  I know I can do that at Blockbuster, but it's only for a week.  Gamefly, if I keep it a month, ends up costing me $20 bucks before I can finish it...

Last, but not least, if the used game turns out to suck, I can always swap it out for up to 7 days for something else. 

You know Brightspot.tv makes GameFly only cost $5 a month...and it's much less complicated than your system of buying used games and then returning them.

Also, Gamefly gives you $5 every so often to go towards purchasing used games from them, which are already significantly cheap.