To be honest, the only real costs are the motor, cable, O-rings switch and last a piece of tube I could manage at the local plastics shop. All together maybe arround 15 dollar. The plastic base and the aluminum is stuff I have in bars that is collected over the years for free. (rest pieces are easy to get for free).
The MonacoRC and the Hudy product is arround 120 dollar.......

With about 4 hours of work it is ready. To remind you, all my machines ar no CNC.