To celebrate the release of two more Subsystem units (Internet of Things and Write a Phone App), we are offering free shipping to the US until 3/12/2017. Use coupon code: FreeShipUSA at checkout and your order ships free. Free is good, right? We thing so. We thanks our customers so much for your support and great feedback. And be sure to check out our free resources to students section. There is some fun stuff there and it will always be growing.