Thumb Thimble

Does anyone know where I can find a large-size thumb thimble, also called a tailor's thimble? It's metal and has a hole in the top. The one I have is a size 11, which was the largest they had in the shop when I bought it several years ago. They don't carry them anymore. It's too small for a friend who wants to try using one. She has some arthritis and her thumb is broad and flat. I've been searching and can't come up with a good source. Any suggestions? Thanks! NancyH