I just bought a used hub at one here in San Diego. It is in kind of a marginal neighborhood, but the owner seemed like a very friendly guy. The shop is called Pedal Pushing. It is located in the 4900 block of El Cajon Blvd. Looking at the sign with service prices they seemed reasonable. Used bikes, some new accessories too.

I needed a rear high flange hub for a Nishiki International I am repairing for my son's friend to take to college. I was going to rebuild the rear wheel when I noticed cracks in the original hub. He had a decent Sunshine hub for $8, not bad at all IMHO.