ThinkGeek is celebrating their 19th year in business with a spectacular Anniversary Sale. They also have a Free ThinkGeek 19th Anniversary Tee Offer: just spend $50 and get the Anniversary Tee for free. As long as you’re buying stuff for up to 80% off in the sale, you might as well get the free t-shirt on top of that.
To get the t-shirt, add the ThinkGeek 19th Anniversary Tee to your shopping cart in the correct size. Browse through their site including the Anniversary Deals and Sale Department and select at least $50 of additional merchandise ($75 if you want free shipping). During checkout, enter the ThinkGeek promo code NINETEE to get the t-shirt for free.