[Noah930]

You're asking two separate questions. 1) Cheapest price, and 2) Best loan rate.

For the cheapest price, do what nostatic suggested above. Email the internet salespeople for some SoCal dealerships. Tell them what you want and what you want to pay. Some will respond, some won't. Take the best price quote you get and then see if the dealerships geographically closest to you will meet/beat it. Takes maybe two or three days of email tag to do this, but it's the least painful way to go, IMO. I've purchased my last two new cars like this.

For the best finance rate, other than what vash suggested I don't know what to tell you as I've had the fortune of paying cash for cars.