Straight razor / shavette shave?

Even though I've been living in Prague for quite some time, I've never come across a barbershop that offers straight razor or shavette (like a straight, but uses a disposable single-blade razor) shaves. I recently heard that such places exist in town - anybody have an idea where they are? Seznam and google haven't given me any leads.

I'm aware of the fact that straight-razor shaves are illegal due to health laws, but the shavette offers a way around that since the blades can be disposed of after each shave.

Thanks.