Batman isn't a Nintendo game is it, why would it have a slip?
I'd get it online, might not be in-store tomorrow because it was a Daily Deal. Have the other ones been kept on?
Daily deals have pretty much just been 1 day, though it may just go back up to £30 for a bit instead of the full £40.
EDIT: Haha ignore me, previous post says Far Cry 3 is on to Christmas Eve!