Thanks for the reply.
Since the Pentax meter is so often not stocked in camera stores now, I guess pretty much everyone who is ever going to buy one has already bought one, so the same applies to the holsters.
In case I find a used one, I am still interested in hearing opinions. I would not even bother if they are a pain in some way. I'll probably rig my own version instead, using cloth.
Apparently, they were made by Zone VI as well.