Hasegawa is the best of the secondhand places I've been to in tokyo, fair bit of stuff with decent prices sorta a bit similar to an australian wrecker, much cheaper than the "it's secondhand parts but we'll lay the shop out like it's new parts" upgarages. Excellant for turbos (especially big ones), good for brakes, fair bit of driveline stuff, lots of suspension bits (though the coilovers are almost all crap), fair few seats, exhausts etc, very very few electronic parts.
soop, if you can't find aoto station you're going to be in bother Follow the Toei Asakusa/oshiage line out to where it hits the keisei, thats aoto. 22nd is a bit late for me unfortunately, I'm only really free for the next couple of weeks