hulk197 is correct. I got both the stair display cases and single display cases at the container store. They are relatively cheap ($9.99 and 4.99, I think). I also get my storage containers for extra minimates at the container store. When I get home, I will try to post some pictures of the storage containers in case anyone is interested in them.
In the front row is Invisible Woman and Mr. Fantastic, where did you get those two? How about a close up.
Scott