Here are both 85mm lumifield finders - the "automatic" for use with the V/VI/L series exclusively, and with parallax lever, for use with Canon P as well as all other RF cameras. Sorry, both missing some black color, but are very bright and clear to use.
As for the 50mm, for some reason, they seem to be as expensive as Leica's SBOOI. Probably because it was at the time when it was sold all Canon RF's had great 50mm frameline finders and it was only usefull with older cameras, or as a accessory for the 50/0.95.