If you bought it directly from Apple, and it's within the 14-day return window, if you bring it back with all of the parts/pieces/box (and the receipt), they should be able to refund you for that one and purchase you a new one. Won't cost you anything. However, if they don't have any new ones in-stock, that's not going to fly.
If you didn't buy it from Apple, or it's outside of the 14-day return window, then yes, make a Genius Bar appointment before you go. All you need to bring is your iPad.