thanks! i have 24 holders now, but my last day trip to yosemite, I wound up shooting all of them, 12 color 12 B&W, as well as 6 rolls in the 6x9 film back. maybe it was just one of those rare winter days there, perfect blue sky with great white puffy clouds, little to no snow on the ground, lots on the peaks and hardly any crowd! so I had lots of time to compose, rather than spending lots of time looking for isolated spots to keep the masses out of my photos. it almost seemed like I could head to all my usual spots, set up, compose, shoot and move on to the next one with nobody to stare at the "old" film camera and so on. it was a marathon developing 2 days, but well worth the shots.
i just came across a guy selling 30 holders for under $4 each and wanted to buy them, but couldn't justify them as I figured I had enough. so the next day I go out, shoot too much, and then decide I could maybe use a few more

typical behavior for me.
john