Boing Boing's Weekend of Wonder: last day to get 20%off

Last day for 20% discount! (Use BOING in the promo code field). Weekend of Wonder (September 18-20, 2015) is a three-day festival where you will learn about exciting new DIY technologies, make cool stuff, immerse yourself in an alternate reality adventure, hang out with nerd superstars, and be surprised by cool special events you'll never forget.