I used Edmunds.com. You configure the car with the options you want & it gives you an estimated price. Then you have the opportunity to get quotes. Enter a zip code & they email three dealers for you. I entered three Bay Area zip codes and almost all responded. Two or three "got it" and responded with very good discounts, within 2 or 3 hundred of their last best price.

All by email. Low hassle. The sales guy at the dealership where I finally bought the car said they realized the Internet sales were all about price & they knew they really only had one shot in that first response.