The 2017 Mercedes-Benz SLC 300 is available as a 2-door, 2-seat convertible. Starting at $47,950, the 2017 Mercedes-Benz SLC 300 SLC 300 is powered by a 2.0L, 4-cylinder engine mated to an automatic transmission that returns an EPA estimated 25-mpg in the city and 32-mpg on the highway.