I have sold several hundred of the prototype boards discussed here on Ebay. I made less than a dollar on each but it was fun to connect with like-minded hobbyists who seem to have found the boards quite useful. I’ve gotten bored with filling small orders and plan to keep the remaining stock of manufactured boards for my instructional endeavors. But I wanted to make the files for manufacturing new boards available.
If you want to have your own PCBs made you are free to do so as long as you keep the robot50.net as the only website on the silkscreen. This includes for commercial use. The Gerber files can be found here. The original blog post specified the manufacturer I used in China and I will note that I never had a problem with them across several orders.