TIAO Smart Sprinkler
From TIAO's Wiki

10 PCS, 10cm x 10cm, 2 layers prototype for $38.80 shipped!
Fast and low cost PCB prototype service at http://www.youpcb.com
Tutorials for [TIAO Smart Sprinkler http://www.diygadget.com/tiao-smart-sprinkler-pi-16-station-sprinkler-controller-open-source-desktop-mobile-app.html]
Fast and low cost PCB prototype service at http://www.youpcb.com

10 PCS, 10cm x 10cm, 2 layers prototype for $38.80 shipped!