Bought the 2004 C230 new from a dealer that sells them online too. I won't say what I paid, but a salesman/friend at another MB dealership could not come within $3k to the price we paid.
Anyway, Hilda (the car) has not given us any problems, and we hope that continues. Now that it's out of warranty, I plan to do some of the maintenance. (We used to have a 87' 300E which I maintained till it was totaled. Wife suffered no injuries. The other car involved looked like an accordion.)
I just drove about 1000 miles. Averaged 27 mpg (including NYC traffic). On the highway I was getting about 33 mpg, with one leg at 34.5 mpg. Who needs a Prius???
I've already downloaded some good info from this site. I hope to be able to add to it as well.