If you live in a car-mad part of the country, get pricing guarantees from carsdirect.com. I have a friend who owns dealerships for the brands of car we bought the past three times, and he couldn't touch what I could get here through carsdirect.com. And carsdirect.com beat Costco, AAA and our credit union, too. USAA has a good car-buying program, as well. But it's all very region-specific.