Through 5/16, get 2 T-Shirts, normally $19.99 each, for $20 in-cart at ThinkGeek. For example, add the pictured Men's Harry Potter Choose Your House T-Shirt for $19.99 and this Book Was Better, The Ladies' Tee for $19.99, which drops your total from $39.98 to $20 in-cart, a 50% savings. Shipping adds $6.95 or is free on orders over $75. There is no sales tax (except VA, OH, and FL).