Today I finally invested in a four piece grinder and while at the headshop grabbed a dugout for my nightly walks
its a little box that carry's a bat or a very small regular pipe. Most have a small storage compartment out. Check them out if your interested.
$25 at my local headshop. And the dugout was only $7. Slightly over priced but I don't mind supporting the store.
I think i have the same grinder aswell, $25 from a headshop is not bad at all, they usually charge like $50 for something like that. Very good grinder, haven't cleaned it once in a year of heavy use (like 2 grams a day) still work good. Careful with drunk/high friends though, its aluminum and it will crossthread easy (mainly the keif part).
I have seen stone ones here. There probably is aluminum as well. I doubt there is one in a glass case, but some may have a glass bat inside.