off that last year and used same service to negotiate a good deal on an Elantra GT for the wifey few months ago.

Select the car and features you want, zip code, and then you get 2-3 non-negotiable certificates for nearby dealers. They have to honor the price or if you take the certificate to another dealer they may match or beat it.

Truecar.com is free too. Just don't print your certificates unless you are ready to get inundated with calls/emails from the 3 dealers.