Amazon: Harry Potter T-Shirts $4.50! June 24, 2010 This post may contain a link to an affiliate. See my disclosure policy for more information. Amazon has four different styles of Harry Potter T-Shirts marked down from $24.99 to only $5! Use coupon code CRAZETEN and get an additional 10% off, which makes them only $4.50! These shirts are eligible for FREE shipping with your Prime Membership or on orders over $25. Thanks, SwagGrabber!