If you have the best buy @GAMER magazine coupon for 15 bucks off ME2, this game is only five bucks. Personally I already have the PC version but wouldn't mind a playthrough on the 360 for only five bucks. Plus ME one save is on my 360 so importing that into ME2 is kinda cool.
Anyway, even if you don't have the magazine it's only five bucks, so you'd be paying $10 at most. Not too shabby for those who have somehow avoided this game so far. This was for the 360 version, but I'm pretty sure the PS3 version is the same price.
BTW got Batman Arkham City for 10 bucks with one of these coupons too ($30 this week, plus $20 off coupon)