Ok, got a question, I preordered Gladiator from Amazon and since X-Men is now coming out on the same day, I would like to add it to my order to save some shipping costs. The only problem is items purchased with a gift certificate can't be combined with other orders. I used a promotional gc for the order, along with a freeride gc. My question is, if I cancel the order, will they give me the money from the gc back, especially the promotional one?

They might credit you back with a regular GC if the promo GC has already expired. Before cancelling, I would call them up and ask.