This is closed now. I’ve chosen the adafruit design as it is open hardware (https://github.com/adafruit/Adafruit-Prototyping-Pi-Plate). The board manufacturer (iteadstudio.com) I use charges $US19.90 for 10 boards (will be green).   Shipping is about $US0.50-1 each (varies a lot with the weight).  I would like to kick at least $US1 per board to Adafruit for the […]