Autotrader has 14 Used Mercedes-Benz GLS 550 cars for sale near Newark, NJ, including a 2017 Mercedes-Benz GLS 550 4MATIC, a 2018 Mercedes-Benz GLS 550 4MATIC, and a Certified 2017 Mercedes-Benz GLS 550 4MATIC ranging in price from $41,750 to $69,339.