Just following up, found some of these on Amazon for ~$43/ea. Made by a company called Lighthouse.
https://www.lighthouse.us/vario-g-pa...mechanism.html
Bought one to check it out and liked it, So I bought a couple more. I used regular Ultra Pro pages with the binders.
I liked these because they had the slipcases with them so I can store them with the pages dangling on a bookshelf. The engineer in me is now wondering if I need to work up some sort of metal grommet on the page holes.
I'm also ready to make up some nice wood bookends to keep them from getting knocked over by a random child or household pet.