It's another "prize pitch" scam. They tell you that they're from a large retailer (e.g. Sears, Wal-Mart, The Bay, etc.) and that you've won a prize in an in-store draw. Then, they say that you need to pay a handling/service/administration fee to claim the prize.
Obviously, there is no prize. And I shouldn't need to say that giving them your credit card info would be pretty dumb.