I used to buy parts at Zoo Music, but I don't know if they still sell bodies, haven't been there in a few years. But stewmac has everything you could ever need. The parts are good quality, I built a tele about 8 years ago with a lot of their parts, it sounded great, I used the texas specials for a killer tone.
http://www.stewmac.com/
http://www.stewmac.com/