Answer: First consult fueleconomy.gov to narrow your list of potential cars based on mileage; then check Kelley Blue Book's "New Car Blue Book Value," the price these autos are really selling for now.
Stick with vehicles going for less than sticker, generally those in the 30-mpg-and-under range. Pick three and check them on CarsDirect, which allows you to select specific trim and options, then see an offer price from a local dealer.
Next e-mail Internet managers at up to eight local dealers, telling them about that quote and asking if they can beat it. (These people usually cut to the chase fast.) Go for a second round with your new low. Ideally you'll end up under Blue Book Value