This used 2012 Mercedes-Benz S-Class in GILBERT, ARIZONA proves affordable luxury exists. This car doesn't look like it has a few plus years on it. How much does the 2012 Mercedes-Benz S-Class cost? $67,991 With only 36,320 miles, it has plenty of life left in the tank. Its a 621 horsepower, 738 ft lbs, v12 biturbo Iridium Silver Metallic car that makes road trips pleasant and blisteringly quick. Drive to Mercedes-Benz of Gilbert and test drive the 2012 Mercedes-Benz S-Class.