Autotrader has 29 Used Audi S5 cars for sale near Boston, MA, including a 2011 Audi S5 3.0T Premium Plus Cabriolet, a 2012 Audi S5 3.0T Premium Plus Cabriolet, and a 2012 Audi S5 4.2 Premium Plus Coupe ranging in price from $15,795 to $50,998.