My technique is to look, look, look.
No way should one buy on just on the bottom line asking price without taking a look. I have seen asking price of 20k for a car and final sale for much less. Personality and circumstances have a lot to do with a deal. Many times the asking price is more than fair. Vince has a reasonable price, that maybe an exception, you must go look at every one you hear about. I'd like 18k for my car, but I'd sell for 16 if I liked the person and they bought me a nice lunch.
Tuesday theory:
I got a really good buy once because weekend lookers nit-picked about cosmetics, asked insulting questions, low-balled on the price, etc. I liked the car, the owner and I got along, I told him how nice his car was, care, love, sorry you are selling and such. Called back Tuesday, car hadn't sold, had insulting offers, was pissed off. Told me what the offer was. "Shucks" said I. "I'd have bought it for that" Sold! It was a fair deal. Did the same thing with my speedster, no one responded at the car show. I bought Super Silver Haze on Tuesday.
If you are brutal, look for divorce, death, or duress. The 3D theory of purchasing.
Good luck