Pi Day Sitewide Sale | ThinkGeek | Use code PIDAY19
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Nerds, Pi Day is yours and to celebrate, ThinkGeek is taking 31.4% off of your purchase for one day only. Grab geeky t-shirts, or a mug to show off your loyalties, whether it be Lannister, Stark, Gryffindor, or Avenger.

Just make sure to use the PIDAY19 code during checkout to get the discount.