Umm, this is going to sound really retarded, but here goes nothing. Check out summitracing.com. They sell electric water pumps for race cars that run on 12V DC. They use these so as not to steal horsepower from having to turn them with a pulley. I want to hazard a guess of around $100-$125 USD for the price. Hope this helps some. Heh, only contribution I can make to the list since my subs nowhere near done =) Brad