Never heard of that one before!!!!
I can actually plan a visit there on my next trip to Tokyo he he (well, hopefully anyway -- usually pretty busy on these trips though, and Akihabara's kinda big...)
Retro stuff in stores around Aki are fairly common but I never knew of a entirely dedicated place for it. Although that there is one (and now that I think of it, possibly more...) makes sense indeed as there sure is demand in Japan too.