I'll keep looking around a bit later when I have more time, but my suggestion would be that if you know anyone who is good with power tools, maybe finding an image that you like, and then having them cut it into a piece of wood for you. Or if you have something like a Dremel, you might be able to make your own.
Currently, there is no exact information in the internet about where you can get Egyptian cat wooden stencils. However, you can check in stores like eBay and Nextag where you will need to talk to a customer service. They will then advice you on where you can get it.