Negotiation skills and buying a Used Car

Didn’t you buy a car back in 2009? Asked for for and got lots of help here on cc from kind and generous posters: http://talk.collegeconfidential.com/parent-cafe/800093-help-my-car-just-quit-on-me-p6.html How did that go? What did you buy? Were you able to get the price you wanted? Was it certified preowned? How did the negotiations go? What did you learn from that experience that you can share with posters here?