You can soon purchase an Arp-8 module on Etsy 9/29/14. Why Etsy? Well, I currently can only afford to do a small run of modules. This will fund future, larger-scale, production runs. As well as give me the opportunity to manufacture other modules.
The price is $180. I'll put the link up once its posted. Or you can look up the store LCF Industries, on the site the day it goes on sale.