I would call to confirm that it is on the shelf before heading out, because 1, they might not have it in the store yet (they might, but the boxes would say do not sale until xxx date), 2, we do know that the official release date is Oct 6th.
I used to be a heavy gamer, and you have to be really lucky to get an early release.
I do hope someone would be lucky enough though, so we can heard some early review of the game