I always do the price research on the car I want first, and my goal is to be at or near factory invoice. They still make money that way with their "hold back", and I do want their sales person to make a fair amount off the purchase, just not rip me off. Getting to my researched number and out the door afterward is always the nightmare. The worst part of buying a car is the "the dealer process". Making you go "meet the boss". After price negotiation, forcing you to listen to extended warranty, sealer, etc. pitches at the cost of thousands of extra dollars.
For this purchase I still had to take a phone call from "the boss", who tried to get me to pay for 3 grand more in bullshit extras. But this time I just set the phone down (on speaker) and continued what I was doing on my Ipad while he droned on for about 30 minutes. Then I politely said "no thanks" when he was done. A couple of times he asked me a question and I had to get him to repeat it. 
I doubt I'll live long enough to ever need to buy another new car but if I do, I'll be doing it this way.
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