Buying a car is easy for me. I go the same sales guy every time - someone from my Masonic lodge. He prints out the dealer's numbers (the real ones, including holdback), and tacks on $100.
In return I send just about everyone who ever asks me to him.
Even if not for the Masonic connection I'd still use him. He's the most zero-bullshit car salesman I've ever seen. "You don't want that one - it's garbage." or "Yes, it looks good, but you have no business spending that much right now." You'd think he would be a pauper but he's extremely successful and has very loyal repeat customers.