Google has now added car searching to their normal search results!  If you search for a vehicle make and model (for example Honda CR-V) one of the first results (under the money-making paid advertising) will be a field for you to input your zip code, the make and model of the car (pre-filled for your convenience except for your zip code the first time) you can search for dealers selling that vehicle used or new within a radius of X miles.  On top of that you can further restrict things by price.  You get the google map as well.