Who here is in Japan

[morgorath]

Bring as much as you are willing to spend...

To add to what Schultz said...This is an understatement... :!: Man time me and Schultz find are self throwing down 500 to 2000 yen and not even blinking, but if we were to do the same this US dollars it's like...
"5 bucks for a magazine say what...?" So be careful the lowest denomination in bill form in 1000 yen and that is $8.70 (current yen rate 115 so 1000 / 115 = $8.70) You have been warned.

Next where you eat at makes a huge difference on your bank book. If you eat at Yoshinoya it will cost you Y280 a bowl (R 280, L 340, XL 460)
and then unless you drink water soda is another Y100 (but you will pay for a large so Y200) now this brings you to Y480 add 5% tax and it is Y500 for you meal. Any American place add Y200 to that for a round about figure. My suggestion is if you are on the move get your meal to go with no drink. Then your bill is Y300 and you can stop at a vending machine (with a better selection) and pop in Y110 and get a soda. The pay off is that in a restaurant the soda is in a glass with ice and you get maybe 100 milliters. At the machine you get a can with pure soda, tea, whatnot and it is 200 milliters or 350 milliters (on big products like coke & Pepsi oh and that bonus 150 milliters is free)

Finally if you are in Tokyo a good amount of the people speak a small amount of English. But don't except much beyond something like this...
Hello, That cost ______ yen. Goodbye. From most people that is their #1 interaction with Americans so please make a good impression for your self and the rest of us. Oh and don't call your self an Otaku unless you want to be laughed at or looked at funny...