Yeah, so I was just walking down Chuo doori, with a couple of games in my hand, just minding my own business, when I see this hot lady proposition me with a "Wonder BJ". What can I say? I couldn't resist. I walked into the store, asked her for a free demo, and - man - that was definitely a Wonder BJ. An Excellent BJ, even.
The department stores of audio and video heaven that line the main street of Akiba are great even if they're not into the games you want. The environment here is all its own, and IMO I see more people from foreign lands in this part of Tokyo than anyplace else. So feel free - you've got a whole day to kill here. The trains don't stop until eleven or so anyway. Cut across the street and see what you can find.
* The "Wonder BJ" is a printer. Sorry.