I know it's a hard sell compared to the $5 Raspberry Pi zero, but http://microbit.org/ The BBC micro:bit is a pocket-sized codeable computer with motion detection, a built-in compass and Bluetooth technology, which was given free to every child in year 7 or equivalent across the UK in 2016. A collaboration between 29 partners, the BBC micro:bit is the BBC's most ambitious education initiative in 30 years, with an ambition to inspire digital creativity and develop a new generation of tech pioneers. They are on sale at Microcenter. $10 is the bare board. The kit includes battery holder, USB cable. The edge connector seems to be hard to get :-( http://www.microcenter.com/product/480031/MicroBit Element 14 Micro:Bit now $9.99 (was $12.99 SAVE $3.00) 10+ in stock at North Jersey / Paterson Store http://www.microcenter.com/product/480034/MicroBit_Go_Kit Element 14 Micro:Bit Go Kit 10+ in stock at North Jersey / Paterson Store now $11.99 (was $16.49 SAVE $4.50)