I recently came across some information you might want to check out:
http://www.segagagadomain.com/gaminginjapan_select.htm
http://www.segagagadomain.com/RetroCorepage-main.htm
http://www.archive.org/details/RetroCore-Akihabara_Special2005
Also, I once talked with a guy who owned a little video game shop in Taiwan, and he told me there are shops in other parts of Tokyo that are cheaper than shops in Akihabara. Maybe those are the "Junk shops" that are written about at Retro Gaming in Japan.
I hope that helps.
http://www.segagagadomain.com/gaminginjapan_select.htm
http://www.segagagadomain.com/RetroCorepage-main.htm
http://www.archive.org/details/RetroCore-Akihabara_Special2005
Also, I once talked with a guy who owned a little video game shop in Taiwan, and he told me there are shops in other parts of Tokyo that are cheaper than shops in Akihabara. Maybe those are the "Junk shops" that are written about at Retro Gaming in Japan.
I hope that helps.