I'm lucky in that my daughter lives in Tokyo and I can get her to send or stash for when I visit. I'm mostly on Yahoo Auctions, with Japanese being my second language it's fun to search and browse whilst watching out for key info on parts condition. Very interested in this thread- many thanks...
Mmmm... Well, I also have another couple of options. I have a fully built 1 x 10 bike (could swap the Exotic rigid forks for a Sid). DM me if interested.
From my memory of being in Japan at that time (and riding in the only annual cyclo-cross series bitd) Toei were more of a touring / pass-hunting frame. Never saw a 'crosser riding one...