Amazon.com: Tokyo City Atlas: A Bilingual Guide (3rd Ed.) (9784770025036): Kodansha International, Atsushi Umeda: Books
The best Tokyo map I've ever come across. You can't get lost if you get this. I've used it two times already (2 visits) and I've never gotten lost. I will take it there again in March....
I bought mine in the states, but my friend got his in a bookstore on the Meiji Dori, close to the corner with the street that runs into Shibuya crossing....