I think I've seen maybe 5-6 over the few months for sale in the states, including a pristine one in Palm Desert, CA. Few in the previous two years. I suspect the tops break and folks don't know how to repair them.
Definitely need to know what you're about to get into. I have been in contact with two members in Europe with Open tops. Mallard and MR-bear. they have posted here on fixes and contributed.
They are in Europe. Just not very many according to Kitty.
