Pro tip if you are artbook hunting in Tokyo : Forget Akiba. It's crowded its full of tourists and there isn't much oldies, only moe and anime stuff.
You want to step up your game ? Try Nakano Broadway. The mandarake shops are amazing and they will ring their sub shops to find your stuff in the mall. I even could talk with severals vendors with basic english and laugh a bit. No tourists, less crowded, much MUCH better selection of oldies selection (of everything, from toys to original celluloids, games, even metal advertising plates...) it's an incredible place to wander around, like a trip in the past up the the 70's of Japanese hobby culture.
I can vouch for this. I also sometimes go book hunting at Jimbocho, though the shops there tend to be a bit more eclectic but there's a huge mix. Love the area.