I'd suggest waiting as long as possible in hopes that the price on some of these games will drop even more, then sending in the rebate. It's kind of a hassle, but hey, $10 is $10.
Also, the rebate rules say nothing about whether the game has to be brand new. So, if you go to Gamestop or wherever you could theoretically buy a used copy and still get $10 off.
Update: I called the rebate center for this deal, and the rep did not say it had to be a brand new game, but suggested that if you buy a used game to call them to confirm that the UPC is valid. Obviously the UPC on the game case would be valid, but maybe she meant the UPC on the receipt might be different if its a used game.
Edited by kevin82485, 09 December 2008 - 11:28 PM.