Oh yeah...
I use Guitar Nucleus (
http://guitarnucleus.com/) for a lot of parts and pieces. Particularly for electrical things like Switchcraft, CTS, CRL and Oak Grigsby at very good prices (which is what you get if you buy the OEM branded stuff or DiMarzio, etc.). They have the cheap stuff too (and a few unique bits like sheets of copper foil big enough for a Strat pickguard), so you need to know what you are looking for to pick out the good stuff.