ThinkGeek takes 30% to 60% off a selection of merchandise for its 18th anniversary celebration. Plus, bag a Timmy Tattoos Unisex 18th Anniversary T-Shirt for free with orders of $50 or more via coupon code "INKED". Shipping adds $5.95, although orders of $75 or more bag free shipping. Save on apparel, costumes, toys, blankets, and more. Deal ends August 13.

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