It would be just a lucky find if you come across one anywhere. I stumbled across one back in the 80's in a small brc-a-brac shop in London. The bloke didn't know what it was. He was using it to dry and press hand towels from the toilets! I offered him a fiver and he nearly took my hand off!
From then on all my prints were dry mounted, and there was always a steady flow of camera club members coming to my garage to use it. It got discarded during the course of two house moves more the pity.
Good luck in your search. If you find two let me know please!