Get a replica of your skull

Here is what I was thinking: you can get a digital 3D scan of your skull through a CAT/CT scan, which is essentially a series of 2D scans stacked one on top of the other. You can also print things in 3D these days, using one of various technologies available industrially.
Considering you can pay a company to sequence your own DNA for less than $500, why hasn’t anybody come up with a business plan to make a model of your own skull? After all, most dentists will let you keep the “model” of your teeth after they are done with the impression.