I found these:
The bottom of the tin has a holder, while the inside of the lid has some foam padding, so the discs is fixated on the nub. Although I'm wondering how you get the disc out of the tin... if the edges are too high, you won't be able to get your fingers under the disc.
Also I can't think of a way to put them on a shelf without simply stacking them... not too fancy, I guess.