I just purchased mine about 2 weeks ago, so I don't have as much experience as some of the other members. I found mine online on Cars.com in Minnesota (about 12 hours from where I live). If you can physically inspect the car yourself, I would look for worn rotors, excessive tire wear, cleanliness (inside, outside, and engine bay), and also get a CARFAX report on it.

In my situation, since it was difficult for me to get out to MN to look at it, I paid for an inspection through Carchex.com. They use ASE certified inspectors all over the country. It cost me $99.95 and a tech went to the dealership, took a bunch of pictures inside and out, drove it, and did a 155 point inspection on it. I had the report emailed to me about 4 hours after the inspection.

Good luck.