Best Buy offers $100 in Xbox Live Gift Card multi-packs for $81. (Add two of the $50 multi-packs on the page to your cart to see this price.) With free shipping, that's $4 under our October mention and the lowest price we could find by $19. When redeemed, these cards add $100 to your Microsoft account, allowing you to buy games, DLC, music, and movies on the Xbox Live Marketplace.