I found mine from a private owner. She had immaculate and complete records of all services done to the vehicle in the 94k miles. This paid off when I had to have the motor rebuilt because of the sludge issue. If it were not for these records, and the Audi extended warranty of 8 years unlimited mileage, I would have paid over $3k for just that repair.
I still have put over $2k in the car including a flex pipe, abs electronics, an igniter, plugs, and a maf sensor in the last 12 months. I do my own oil changes and those cost me $32 each due to the Mobil1 0W50 and special filter that are required. I also know I need at least one wheel bearing now, as I can hear it singing.
Trust me and the others, unless you have a factory warranty, or the best extended coverage on the planet, this car is gonna quarter and dollar you to death as a daily driver. Don't think that I don't love my A4. It's still a PITA!