ThinkGeek takes up to 75% off clearance items, with prices starting from $4.99
$1.99. (Prices are as marked.) Plus, get the ThikGeek Men's Irrational Pi T-Shirt for .) Shipping adds a flat $7.95, although orders of $75 or more bag free shipping. Discounted items include apparel and more from Star Wars, Pokemon, Doctor Who, Marvel, and Star Trek.
free with orders of $31.41 or more via coupon code "PIOUS". (You must add the T-shirt to your cart