Hot off the presses, a new design is available to celebrate Pi Day 2015! Order soon to get yours in time, or order yours later to commemorate the fact you were there.
They could also make great prizes for Pi Day celebrations, drawings, or math fairs! Shirts in many colors, mugs, hats, even baby-wear and ties are available.
If you would just like a freebie, download my Pi Poster. And for classroom activities, visit this site to get them for $1.99.
Happy Epic Pi Day!!