Check this out - good old Ryobi, the things you can do with a 12v power drill battery
The IC selectors down the bottom are missing the two DIP switches, they should be here in a few days - in the meantime, two small pcb jumpers (red) do the job just as well.
Assembly time was about 25 minutes, but most of that's the pins and IC cradles - there's no tight component grouping or SMD's, so the rest is real quick.
Here's it with the mini-usb.