I am always looking around for the best place to buy my camera gear at. There are always your go to sites such as B&H or Adoram but its always good to know of a local shop to go and look at pro equipment and know your not getting ripped off. There are a couple of places in San Fran that are good for that but out near me the best place I have found is Camera West in Walnut Creek. Its tucked away upstairs across the street from crate and barrel but is AMAZING! and the people who work in there are really friendly and know their stuff. Check them out next time your in the area.
1255 S Main St
Walnut Creek, CA 94596