So does Wal-mart do price guarantees? If I buy one this weekend, can I return for the price guarantee on Tuesday?
7 days for their price adjustment policy, and 15 days for returns/exchanges.
If you are past the 7 days for the price adjustment, you can return AND rebuy your same 3DS if you aren't a dolt with your wording/irateness to the customer service clerk. The associates sometimes even encourage their customers to do it that way as there is nothing that can stop them otherwise, and it makes it easier for them so they don't have to do a package check.