i just returned from japan and was a bit let down by the selection and prices of 1/6 stuff. the building in akihabara was the best and only place a spotted loose items, with interesting stuff on all floors.
aside from tokyo, i spent time in sapporo where i could only find a couple of stores. post hobby in a corner on the fifth floor of the parco building... mandarake on the fifth floor of the cosmo building... unlike the tokyo location, the volks store in the second floor basement of the alta building had ZERO relevant 1/6 stuff and mainly girly goth doll crap - a big disappointment... another disappointment was the yellow submarine shop up in the arche building (seventh floor?) - it has downsized since i was last there and the few other stores i was looking forward to at that location were gone, having been replaced with very, very loud arcade and pachinko machines (which also occupy the rest of the building, i might add). i found no loose bits and pieces at all in sapporo. oh well...
i should be returning in the new year and hope to research some other places. i know i must have missed out on something good.