The report is.... Tokais are an endangered species in Tokyo. I visited about 12 shops in Ochanomizu. One had an LS-90Q for ~USD 1100, and an LS-135 (plain top, price not marked). Another shop had a used Talbo. A third had a used Strat copy. ESP and PRS were over-represented... broad selection, and in 10 out of 12 shops. EVERY shop had high end Gibsons, and most had a full range from USD 450 Melody Makers on through the latest reissues. One shop had a Robot Gibson LP. The tuning machines are each about 30 mm deep, and 20 mm square.. and HEAVY! I'll never complain about Grover's again. Grass-Roots is a new brand for me... lots of LP copies for under USD 500. A few shops had Grecos and various Fernandes brands.
Broadly speaking, the used guitar shops are on the west side (Meiji Univ. side) of the main drag, and the new guitar shops are on the east side (Nihon Univ. side).
Next, I stopped in the Musicland Key shop on Yasukuni-dori in Shinjuku. Key had about 6 Tokais, none very nice.
I had money in my pocket looking for a used quilt top Love Rock. The money is still in my pocket. The shop staff were extremely reluctant to tell me anything about which shops have used guitars. One guy said he didn't understand English... and I was speaking in Japanese. Typical sales person behaviour in Japan.