I've been looking for them but I've so far only found R. Hiscott carries them for $85 back when I asking 5 years ago (I'm afraid to ask what they charge now).
Not to get a confused this is a wig block.
The one I made out of duct tape is getting really old and the tape is wearing down in terms of adhesive.
For this reason I'm thinking i really need to get a dress form this year instead of the duct tape route. Problem is I have a larger frame and all I'm finding are petite dress forms locally.