ThinkGeek cuts up to 75% off a selection of sale items. Even better, take an extra 20% off via coupon code "TAKE20MORE". Shipping starts around $6 or get free shipping on orders of $75 or more. Coupon expires June 14. Some best bets, each with around $7 for shipping:
Aliens Xenomorph Plush for $7.99 (low by $6)
Adventure Time Footie Union Suit in Finn or Jake for $23.99 (pictured, low by $5)
Before you send in your tax return, double-check that you haven't made one of these mistakes that can trigger IRS scrutiny.