I think the dealers tend to have an internet sales rep a lot of the time these days and I negotiated with that person via e-mail using both TrueCar and CarGurus for leverage. It still takes time though with the various dealers.
The best piece of advice I can offer is that whole rodeo of spending hours at the dealership on the day you finally buy the thing because they want you to talk to the finance manager yada yada. Last time around after arriving at the fair price I asked what time they closed. They said 9pm so I made an appt for 8:30pm and was outta there by 8:50.
