Cost me maybe 250-300 bucks, plus I had a lot of parts lying around. Kinda' depends on what your abilities are with fabricating, sourcing out parts etc. Actually, the most expensive parts were the ball valves. With my set up, I needed 9 of them. Usually 6-9 bucks a shot. Check out 'how to make biodiesel.org'. Great place to start. Another thought, and above all. Make sure you secure an oil source. Without it, your dead in the water.