I heard SU still sells them but you have to ask your demo since they aren't in the catty.
I got generic ones on Ebay though...probably the same as Beth pointed you towards.
I just bought a bunch because I use them for embossing powders since I can drop my whole image in there, get it all powdery and close it when I am done without cleaning up anything. I just have one case for each color/type of powder.
