www.gendou.com, an anime soundtrack website.

or download Ares at www.aresgalaxy.org, it's a p2p server.

http://www.aimini.net

you have to type in naruto in the search box, click on the song that you want, then a new window will pop up at the bottom of that page it will say free download. and you're good!

I'm not really sure but my brother downloaded them for free. I think either dattebayo.com or narutocentral.com. As I said before I'm not sure. Please check.