I found the cauldron creep to be a really fun project that takes a combination of thought, engineering, and creativeness to really do right. Most expensive part is the skeleton for the body, unless you already have one, or want to make a body from scratch as some have done to create witches or other ghouls to stir the pot instead of a skeleton. Framing can be done in PVC pipe, or as a couple of us have done, an internal frame of rebar or all-thread. You will also need 2 motors, either wiper motors or xmas deer motors. I made mine over the course of about 2 months. One month to build and get running smoothly and another month of dressing, decorating, and other embellishments. I got my skelly on clearance for $7 and already had 2 deer motors from retired lawn deer. I probably spent around 50 bucks total on everything that went into him.