Have you looked at the stamp 'n store binders? You can get the large or small binders at Univenture
but you would have to cut the inserts in half to fit the small binders. You store your stamps on inserts
I converted to using the smaller sizeand one of the smaller cases can hold close to 50 stamps. I imagine the larger size would hold close to 100 unmounted stamps. I love mine.
At first glance you may think it's more expensive but it really is not considering how many stamps you can store in one binder. I've been using mine for 2 years and they are very durable. I like that they lock so no stamps ever fall out.