McGizmo had 4 R2H modules (w/ DB700s) for sale in the B/S/T forum, yesterday. When I found the thread, he had one left but he also had plans to build four more modules with DB400. The asking price on the modules was $100. You can follow the thread here. I hope this helps.
Please refrain from initiating basically duplicate threads in other forums. I'm closing this one. Anyone following can respond to this thread in the Mod forum.