One way I am making due instead of buying new, is storing my unmounted and photopolymer stamps in CD cases. My workplace was purging a CD library that they no longer need. They were going to throw all the cases in the dumpster! Thankfully, I was in time to stop them. I've gone through and removed the cd tray from all of them. Over 2,000 cases. Quite the task. But, not too bad for a bordline OCD person like me.
I actually have more than I could ever use, so I've been selling them via SCS. I've sold over 1,000, but still have plenty to share. Here is a link, if you are interested:
cd cases for sale - for storing unmounted stamps