Nope -- You can by them from Bear Air or Airbrush Action online -- If you want samples to copy or make your own stencils - try "skulls" in any search engine
Bones!~
Coast Airbrush in California is an excellent source for stencils and paint and pretty much anything you need. Very friendly people. I order everything I use from them. The "skull master" template by Craid Fraiser is a good one.
coast airbrush is the place to go. I recently got a skull template and a diamond plate template. They really look good and are easy to clean. I'm looking at every skull picture I see now just trying to imagine ways to use it.