Cameron, there are four shops I would have your friend check out.
Bob Marriot’s, which is in Fullerton. http://www.bobmarriottsflyfishingstore.com/ContactUS.aspx
His and Her Fly Fishing, in Costa Mesa. http://www.hisherflyfishing.com/
And The Fisherman’s Spot, in Van Nuys. http://www.fsflyfishing.com/info%20page.htm
Also, in Kernville (a few hours north) is a great little shop owned by a friend of mine. It’s called The Kern River Fly Shop and is also home to Kernriver Troutfitters Guide Service. http://www.kernriverflyfishing.com
The Kern shop also hosts a flyfishing forum which is a great source of info for the entire area. I actually post there daily. It’s a pretty good online community, and members do