Or if you live in an area that has multiple Walmarts around like I do, you could just purchase a copy of SC2 (my walmart keeps their copies in plastic boxes that need unlocked). Once you get back to your car in the parking lot, use a dollar bill to carefully peel it back and take a picture of the CDkey. Carefully place the plastic back down and make sure there are no air bubbles underneath it. I then take it to another Walmart and say that I bought it as a gift and the person already had it so I'm returning it. Walmart doesn't ask for your name, address, or anything if you have the receipt on you.