I notice you live in Southern California, so do I. One suggestion would be to take your grandson to a Quality Stamp Show. These are monthly get togethers of dealers. There's one in Van Nuys and one in Anaheim, so if you are within easy driving distance of either one, you can find a wide variety of stamps and paraphernalia, you can pick up used albums, and generally at least one dealer will be selling hinges.
www.stampshowsteve.com will give you a schedule for all their events