Has anyone had experience with returning a game to GameStop (without opening the game of course) just for the DLC printed on the receipt? I have the Collector's Edition pre-ordered @ Fry's Electronics but I want the '300' pack with King Leonidas. I doubt It'd be a problem but you never know. I think the 'Champions' pack comes included in the game package itself since every retailer seems to have that as a bonus.
I would've bought the Collector's Edition from GameStop but they stopped taking pre-orders for it already.