Great gift, Eagle Rock Brewery sells growlers of their beers. I think a growler would make your xmas gift even more special. You would want to buy it as close to x mas as you can so it would be fresh when they open it. They are open Thursday to Sunday.
If you just want to get regular bottles you have plenty of breweries to choose from.
Alpine, Ballast Point, Alesmith, Bruery, Stone, Lost Abbey, Port, Bootleggers to name a few.
If you stop at one of the better bottles shop that specializes in beer it would be really easy for them to help you pick out an all Southern CA lineup.
715 Dunn Way, Placentia, CA 92870
Eagle Rock Brewery
3056 Roswell St, Los Angeles, CA 90065