I always try to get supplies free, used, and local first, but that was useless. I had to resolve to purchase what I needed online. Now I need to pretend to be patient while I wait for shipping.

I ordered the Teensy 3.1 USB Development Board from PJRC.com. It may be overkill for this project, but I plan to have other fun with it (promise!:)

I ordered female headers from Futurlec.com. They not only had good prices, they had pictures and datasheets with the exact measurements I was looking for. Part number FHEADS40 - “40 Pin 0.100 Straight Female Single Headers” for only 35 cents each. Plus some other sizes.

I also ordered some jumpers and switches from Adafruit. I promise to get all the part numbers and details caught up later.