Mossy owns the SD area - the only independent (I believe) is Pacific in Mission Beach. Have you searched Temecula and further north?
What configuration are you looking for? Last I checked, there's several Z's in stock at all the SD dealerships, with plenty more if you look a bit farther away (there's 2 40th's in Capistrano!
).
You seem very decided on what you want. If you don't want to travel, ask for an price on the incoming Z; you can start negotiating - not sure how much you want to wait.