The Altbairisch Dunkel is the most common Ayinger, at least here. I can get it at my local grocery store, and I live in a town of 10,000. There have to be a ton of places you could get it in San Diego. Just hit up BA and find a couple good beer stores near you.
I'm a huge fan of their Celebrator Doppelbock, and their Jahrhundertbier is a good lighter beer.