My local Gamestop's been selling them since 7:00 last night. And my friend had a copy on his hard drive hours before that (downloaded).
I don't understand why this is such big news. I mean, "Oh My God!!!! Somebody who works for a store that got the game shipment opened it early and leaked it!!!!11!!!"
I mean seriously, this happens with just about every game (and movie) imaginable.