Suggestions on finding good summer Japanese language schools in Japan?

I'm planning to go learn Japanese right in Japan for a whole month(July), preferably in Tokyo, but have no idea where to start. How much would it cost? Where should I search schools from? How do I know if they're good?

I'm looking for a school that allows me to study for only a month and accepts mostly American or European (I'd like to seize the opportunity to practice my English as well). I hope that it can be in or around Tokyo because I have some friends I'd like to visit in Tokyo.

If you have any suggestions of a great language academy, or you have the experience of actually attending one, please share them with me!

Jam it back in, in the dark.

I'm not sure but. Maybe Aeon (not the mall same company I think) has. Aeon, to my knowledge, is a English school for Japanese but they may have a Japanese class counterpart. You can also check if there is a International Sightseeing Center around Tokyo. There was one in where I lived so there maybe one there. 国際交流センター　(Kokusaikouryuu Center) or something like that. If there is a International Center the classes maybe a volunteer type.
Hope this helps.

There's nowhere I can't reach.

use rosetta stone too if you haven't.

This thing is sticky, and I don't like it. I don't appreciate it.

When in doubt, watch anime.

I am a dolphin, do you want me on your body?