19$. Limited Edition Pi day of the century T-shirt Pi day of the century MARCH 14, 2015 AT 9:26:53 AM 3.141592653 will be the most places of Pi we have on Pi Day till the next century. Available NOW! Be Quick to Avoid disappointment, these WILL sell out! Normally, $29.95 - Today you can buy it for only $19.5. This is a LIMITED EDITION, Order yours before we sell out.