[Eimi]

Hello,
I've finally decided to realize one of my long term dreams; which is to go to Japan. It won't be a very long trip, propably a week, since Japan is an expensive country and this will be my first official trip all by my lonesome. Anyways, I was just wondering if any of you would have certain recommendations as to where you could find relatively inexpensive restaurants and shops around Tokyo? Being a big fan of anime and manga, if there are any local shops that are worth a visit?
Also, what would be an estimate of the cost for such a trip?
Arigatou gozaimasu!