iTunes gift card 20% off

Today Best Buy is selling 20% off a $100 iTunes gift card, shipped free.  The 20% discount is usually as good as it gets as a top line discount from retailers, although sometimes you can combine 20% off with category bonuses from Chase Freedom or Twitter/Facebook credit card promos from Amex.  Shop through a cashback site like Discover's ShopDiscover for another 5% off or so and join Best Buy's Reward Zone for another 2% back.  The only better deal is from Staples, when they discount their iTunes cards and then let you use coupons at the risk of being banned as a customer.