Buying a 2012 Hyundai Sonata, and saving $1500 off of MSRP.
Chose dealer based on referral from my company's vehicle program manager. Local dealer was not willing to negotiate over the phone or via email and Chris was. I told him what my local dealer offered, he beat it and then when I requested an even lower price based on my information from Car Cost, he was willing to meet my request. I did not tell him I had the information but I used it to determine how much room I had.