I misinterpreted the meaning of this thread, but it occurred to me the misinterpretation was also a great question-
Is there any site where different prospective car buyers can pool or "mob shop" their purchases in order to get a volume discount?
(e.g. I want a new 2013 Chevy Cruze, and so do 49 other car buyers; when a critical mass of 50 is reached within 3 months, the "tilt" buy takes place and we all pay 0.90 * dealer invoice). GM (or one of their high-volume dealers) makes next to no profit on each vehicle but they keep their numbers up. Could perhaps even Hotwire-style it and limit it to (again, for example) "Chevy Cruze, Ford Focus, or Toyota Corolla" where you don't get to pick which.