Prime members only. Ends 8/18 at 10PM PT. Shirt.woot! has 40% off T-shirts and Other Apparel. After logging in with Prime, the 40% off discount appears automatically at the final checkout screen (Big Place Order button). Shipping is free.

Includes the Top 20 Designs and Bestselling Designs. The pictured design is called Plastic Brick Engineering School ($9 after discount).