I live in the IE and work in OC. The only place I can really think of would be Turners Outdoorsmen. www.turners.com
They carry quite a few surefire products and accesories, I think I saw a few streamlights too.
I bought my Z2 from there and my Benelli.
The price on their firearms are a little steep (thats why I've only bought one there), but the Z2 was maybe only 5 bucks more then I saw it on a web site for. It was still cheaper then the surefire "retail" price.
I only buy my lights online now (the Z2 was the only I bought in a brick and mortar store).
I've been to the Turners in Chino, Fountain Valley and some place in the LA area.
Check Recon-1 in Reseda on Ventura Blvd. GREAT selection of Knives, flashlights, camping and survival equipment. Nice guys over there to. they have lots of my money!
Resurrecting this old thread with the same question. Looking for a good selection of flashlights as I need to test a handful before purchasing. Anything new in the LA area that this old thread didn't cover?