Good point. I got a killer deal on the floor model spirit ball, and I still got an animated witch head out of it, plus I didn't have to build my own base for the ball....so I'm pretty happy with the way things worked out.Another choice for the ball itself is a large plastic or glass globe used for light fixtures. Very popular in the 60's & 70'sm, they are available in many sizes and finishes. they already have a protruding neck with a lip for locking them down. This gives you the opportunity to choose the dimension and style without paying big bucks to butcher someone else's prop.