I see there are some new options for JASJAR cases now:

Piel Frama has some classy leather cases, while PDAir has a number of different cases including a rugged looking Aluminum case. I've added these to the ReviewWiki review page for the JASJAR.

I find that the JASJAR's convertible clamshell design means you don't necessarily need a case for it. I just carry it around closed in my pocket. I do still find it a bit big to carry around.