If I'd noticed this thread before.... Chiba has (or had) a shop whose owner was friends with Kyosho's prez himself and I had a nice long chat when I went there in 2012.
https://skvltd.wordpress.com/2012/06...-garage-chiba/
Somehow I never made it out to the Akiba superstore, but Mandrake out there is simply amazing. Otherwise, I've bumped into various random brick and mortars while exploring about.