I don't think a permit to carry covers grenades... but I could be wrong? There's always the option of not carrying them around. On the plus side, since there's no such thing as an an energy sword here, they're probably not illegal.
As to where to get one, I'd think it depends totally on where you are. But it's Sunday I think. So most places are closed.
I'm sure you still have a groove. You've aged well, if that's anything.