I am considering switching my 2001 SLK320
To a 2014 SLK350. But I don't know what it is worth
Since it has less than 29,000 miles, new tires, new snow tire
And other features, online searches don't work
A private sale should net you in the 14-15K range. I bought my 320, pretty much perfect condition, one owner, clean Carfax with 14,200 miles for 14K from an online dealer in Florida. He probably had about 12 K in the car.