Thanks guys...
I saw two pretty killer mushroom colonies while I was there. One was 6 or 7 hairy lavendar mushrooms, and the other was much smaller 6-7 florescent green shrooms.
Both were $40 - discount, so a pretty good deal. I think I'll be back in a couple weeks to get 'em.
I figure, even if I'm in Japan, they'll still be growing nicely in my tank for my return!