I purchased regular CD cases at Staples in a 24 count pack and removed the black insert that holds a CD in place. I cut a 4 3/4" square of printer paper and stamped the images onto that. Then I just slide it inside the CD case where the liner notes would be. ***NOTE: slimline CD cases will not work***
This way I can easily see exactly what stamps are in the CD case. I also use a label maker and put labels onto the spines of the CD cases so I don't have to flip through all of them to find what I need. Then I store them standing up like books in my JetMax cubes.
So far, the only stamps I have unmounted are the little $1 Studio G ones. I'm just not brave enough to tear apart my Stampin' Up sets yet!
The static cling foam was purchased on Ebay by Okieladybug so I don't know who she got it from. She has a good photo tutorial on her blog about how to unmount the stamps and apply the cling foam.