Start calling around to all of 'em. There's a huge number of SoCal BMW dealers - you can hardly throw a rock without hitting one. Tell them the deal you want and see if they are interested. You can get the deal you want in an area with this much competition - I guarantee it.
Plus... A friend of mine knows an area Lexus service manager. He said last month their dealership went four days without selling a single car. That has never happened since they opened.
A down economy provides ample opportunity for the bold. :thumbup: