In 2005.5 I paid $12,300 for a 1999 C280 Sport with 77K mi.
It has options which made it a $40K car when new.

I purchased it on Ebay; and that was scary. It worked out well though, as the seller was a dealer who had serviced the car for years. The low price was due to the fact that there was no reserve price and the auction ended at a bad time (for the seller) Quite frankly, I didn't expect to win. On a dealers lot this year and model car was going for $14K-$17K.

BTW, even though the miles were somewhat high, this car has performed beautifully. Only basic maintenance.
I love it.