I got mine from here:
http://www.narutochuushin.com/main.p...age=soundtrack

They've got the first and second official Naruto OSTs and the OST for the first movie.

Also
http://nipponsei.minglong.org/index....&search=naruto

Nipponsei almost never fails.
If you're looking for more, try running a search on www.torrentz.com, depending on which soundtrack you're looking for.