Apparently the old Surf Brewery, now under a different name, has a store on the backside, can't remember the name but something like Ventura Homebrew Store (a real original name like that). Haven't been yet myself.
Otherwise, Simi Valley is your next closest. Good luck!
I'm in ventura as well, mainly buy online and have been happy. More beer is usually 2 day shipping to here. There is a place in Santa Barbara. Havent been yet so no clue what kind of selection they have, but will go check it out soon.