A similar geek-themed holiday is March 14, a special day among the more mathematically inclined.

Since 1988, 3/14 has been recognized as Pi day in honor of 3.14 (159265359). While many companies celebrate the holiday in some form or fashion, the retail chain and online giant ThinkGeek is officially honoring Pi Day by offering 31.4% off of everything on the website and in stores, excluding pre-orders.

Just use the code PIDAY19 at checkout to apply the discount. 

ThinkGeek, part of Geeknet, a subsidiary of GameStop, is one of the biggest retailers that has sprung up around the demand for so-called geek goods.

Its success is no surprise either. The availability and variety of gaming and general “nerd” merchandise has exploded in recent years.

Once upon a time, spending hard-earned cash at the arcade, engaging in deep discussions about the nature of the Star Trek universe, or boasting about recent console purchases used to be the main methods by which fans could express their passions and loyalties.

Now, you can greet people at your home with a Goomba garden gnome, have guests wipe their feet on a Triforce doormat, hang their coats and hats up next to your favorite Dungeons and Dragons cap, or offer them something to eat from your nicest Star Trek dishware.

That’s just the tip of the iceberg of what’s available during this Pi Day sale. ThinkGeek’s inventory is truly massive.

If you’re looking for something specific or just want to browse by category, the site lets you do that and is easy to navigate. If you’re interested, the sale ends at 11:59 p.m. EST, March 14.