At Best Buy, purchase one select Prepaid Game Card and take 20% off a second select Prepaid Game Card. (Check the Add to Offer box to the right of your preferred game card, then scroll down to add your second card via the same method. Discount is applied to the least-expensive card in your cart.) That's a savings of at least a buck. Discounted cards include PlayStation Network, Hearthstone, Xbox Live Gold, and Disney Interactive.