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ThinkGeek takes up to 70% off a selection of apparel, decor, collectibles, toys, and more during its Winter Clearance. Plus, bag a Unisex Sir Cumference Quest for Pi T-Shirt for free with orders of $50 or more via coupon code "ROUNDTABLE". (Follow the instructions on the shirt's product page to get this deal.) Where available, opt for $7.95 ship-to-store pickup (at ThinkGeek or GameStop locations) to dodge the $8.95 shipping fee, or bag free shipping with orders of $75 or more. Deal ends March 31.