I'm moving back to san diego next month and my research has found this:
American Home Brewing Supply
9295 Chesapeake Dr., Suite E,
San Diego, CA 92123
Phone: (858) 268-3024
Hours:
Monday - Friday, 11:00 - 6:00
Saturday, 10:00 - 5:00.
hope that helps...let me know if you find something else or a better place(although i've never been to this one).