I see you have listed yourself as a 127 shooter. Do you shoot E-6 in 127? Where do you get slide mounts for those? I thought about snagging a 127 camera and some film but don't see anywhere to get the mounts.
I have not shot E-6 in 127 but yesterday I saw some long bulk rolls of Ektachrome in 46mm that would be for 127. There is also Rollei Crossbird available in 127 that makes beautiful transparencies.
I haven't bought any mounts but I have seen them from time-to-time. Just keep looking.