I've recently had difficulty in finding the plastic pages with pockets to hold my casino matchbooks and matchcovers. This place in Minnesota still has a good line.

First scan shows how they look with matchbooks in them. I keep the matches in if they are older frontstrikers or feature matches. If you remove the matches as shown in the second scan, the matchcovers lie flat and of course you get many more pages in a binder. I do it that way for all the newer matches (mostly back-strikers).

You will probably need both the six pocket and eight pocket pages for 30 strike and 20 strike matchbooks. There are also four pocket pages that will take the 40 strikes, but since there aren't too many of those from casinos I generally just close them and use the 30 strike page with the design reading from the side.