Binaltechs are also available(in very small amounts) at Freaks and Geeks toys on hay street. I'm pretty sure its actuly an expansion of Empire Toys (Notice they replaced all their goth toys with comics?) and sells mostly cloths and random action figures from gears of war FF, Nightmare before chirstmas ect ect.
But you can get some Transformers attire(a bit pricy but they get mark down regularly) and some alternators and other stuff, Like that Optimus Prime Ipod speaker dock and reissue of Skylynx.

Tokyo underground is next to it's spose to be a vintage toyshop but you wont find many transformers there, but I'd recomende it for fans of Car models or Gundam Wing(especialy Gundamwing)