These are the best pages I've found, David. Available at office supply stores at about $2 a page. Heavy plastic that doesn't tear. You can get several cards in each slot if you don't need to see the backs of the card and want to store duplicates, or want to minimize storage space in your albums. They have thumb cutouts to make it easy to insert/remove the cards as well.

Only problem I've found is some lots of these have the binder holes punched a little off and they don't quite line up with the notebook rings. It's also possible the plastic has shrunk or expanded since they were manufactured. You have to repunch them yourself (minor inconvenience).

There are www sources for these in larger quantities that gets the price down a bit. A carton is 12 packages (60 pages) which holds about 1000 cards back to back. Try Office World, Inc.