Just to clarify for myself (and being relatively new here, hopefully I'm not breaking any rules/stepping on any toes for asking this):

Sales receipts print with the serial number unique to the 3DS unit sold? As in you can't return one unopened, factory sealed unit in place of another unit?

I'd like to get in on the 20 free games action, but I'm having a hard time convincing myself to pay out of pocket for a 3DS when I have enough in Amazon gift certs to cover the purchase. Granted, if I recall correctly, Walmart employees are usually less than fastidious when inspecting their returns . . .