Ishibashi is Japan's biggest instrument retail chain, I believe. Their used stuff ships internationally and, with a 15% discount this Sat and Sun, that'll more or less pay for shipping on some items.

http://www.ishibashi.co.jp/u_box/e/
An astonishing range, as usual.

http://www.ishibashi.co.jp/u_box/e/
An astonishing range, as usual.