Called "commission books" or "folio books" and they are made by book binders. Similar to a book cover with no pages inside. The super security minded agencies, inc. the FBI back in the 60's-70's, did it like a sandwich to discourage taking it apart. Folio books had the ID's glued into them. Then, the clear cover was placed on top and sometimes a "window frame" was put on top of the covers. Then the window frame, clear cover, ID, and folio book was sewn together using an industrial sewing machine. If you tried to remove the ID, it would get torn up. Of course, this was back in the days before scanners, digital imaging, etc.
So, if you can find a book binder in town, or locate a company that does diploma covers, you can probably get them to "folio" your IDs for you.
I, personally, love the old ID cards with their engraved printing look and floral design elements, glued into a rigid folio book. The OSS and subsequent CIA IDs are classic examples, as are early US Postal Inspector commission books. True art, often printed by the Bureau of Printing and Engraving.