Traditionally, Pi Day is observed by eating ... pie. If you're ready to get your bake on, this oven- and microwave-safe dish is ready for your favorite Pi Day recipe. Edging with the first handful of pi digits on the dish is sure to rival the fluted edging of the pie you'll bake in it. ($19.95) Let your friends take home the recipe for your favorite pie on these geek-minded recipe cards . ($4.50)