I'm collecting parts and tooling right now to fabricate my own. I could have gone cheaper than I have but I have almost everything to start less the steel tubing, I'm at 1200.00 with a NIB 390 and a TC. I'm figuring with a temporary stock motor 1400.00 to scratch one out, complete roller with the stock 390 running. Motor mods will add another 1100.00 later on down the road..Gets expensive, sky the limit..