Did all of my haggling through email. Knew exactly the type of car I wanted and that I wanted to pay all up front and no financing.

Emailed a few nearby dealerships, they all asked me to come in and I refused. Asked them for the price for the car I wanted. I would send the offer to other dealerships and ask if they can beat the price. Did this a few times until dealerships would not go any lower. Arranged to pick up the car and got it with no problem.

This was about five years ago though and I know the market is different now.