Found this on a Japanese site. Looks like a few people are doing sustainer mods in Japan. This particular one is available at Ikebe (Shibuya store) in Tokyo.
http://www.digimart.net/gk_detail.do?instrument_id=DS00076569
This site can search through new and old equipment in the Tokyo area (at different stores). Check out a used JS90HAM sold for under US$1,000 (drool)...
http://www.digimart.net/gk_detail.do?instrument_id=DS00075227
Also, tons of J-Customs as well. Check out these stunning HRG-03 and HRG-04 (too bad they're all sold out).
http://www.digimart.net/gk_detail.do?instrument_id=DS00047188
http://www.digimart.net/gk_detail.do?instrument_id=DS00045852
http://www.digimart.net/gk_detail.do?instrument_id=DS00076569
This site can search through new and old equipment in the Tokyo area (at different stores). Check out a used JS90HAM sold for under US$1,000 (drool)...
http://www.digimart.net/gk_detail.do?instrument_id=DS00075227
Also, tons of J-Customs as well. Check out these stunning HRG-03 and HRG-04 (too bad they're all sold out).
http://www.digimart.net/gk_detail.do?instrument_id=DS00047188
http://www.digimart.net/gk_detail.do?instrument_id=DS00045852