barnes and noble carry a good variaty. i live on orange county and there's good manga store in general (costa mesa, huntington beach) but the price the price on at local b&n is on par with the ma&pa manga store. the difference on average to me is no more than a dollar. then again, i dl all my manga anyway =) us release them too slow anyway.
PS since you live in rancho palos verde, a 30min drive to Little Tokyo would do the trick.