Maps are problematic seeing as how streets are not numbered. Also stock varies. I have a map of Denden town on a flyer. Ill get someone to scan it in and make a jpeg of it when I get back. Akiba is more all over the place harder to map, also the stock in the second hand stores is totaly random.
Nope, nope and nope.
I did see Deathzaurus and Japanese Fort Max boxed though, but they were at least a grand.
On the non toy front Nikko is another place you can visit as a day trip from Tokyo. I went to the Shrine there the most ornate in Japan as well as Edo Town, which is like a recreation of an Edo village ala old Sydney town when it exsisted. Both were worth the trip from a cultural and entertainment perspective respectively. Hilight for me was the ninja show. A perfectly correographed Ninja battle with sound effects and disco lights. Kinda like watching Monkey Magic live.