Web hosting companies purchase a lot of RAM, and today we got an email offering up some free cases that came with a recent purchase (for some reason it was cheaper to buy them in the cases).
They look like they're made of real wood, and the small grey dots in the middle of the edges are magnets that hold it together. The inside liner and cut out feels like some type of super dense foam rubber.
I realized a RAM stick is about the same height as a NintendoDS cartridge, so I took one home and sure enough they fit perfectly.