ThinkGeek cuts 20% off orders sitewide with no minimum via coupon code "GEEKROAR". Plus, it stacks with sale items, already reduced up to 90% off. With prices starting from $1.59 after coupon, that's the best general percent-off coupon we've seen from ThinkGeek in over a year. (For further example, we saw a coupon for $10 off orders of $40 or more last week; we also saw 30% off select apparel in March.) Shipping starts around $6 or get free shipping on orders of $75 or more. Coupon expires May 26. A couple of best bets after coupon: