Went back with my raincheck in hand today. They were still out of stock of FF13, so I tried to use it on Heavy Rain per the wording on it. Guy in electronics refused, said they will be getting FF13 back in.
He then went on to say I should've never gotten a raincheck for that item in the first place, and he *might* honor it for FF13 when it comes back in.
Some customer service you have there K-mart. It's no wonder they have to do desperation sales like these just to get people in the door, and then they proceed to end them early or have little to no stock.