The 2021 Mercedes-Benz GLC 300 delivers the refinement and performance of a new luxury vehicle at half the original price Stick to the service schedule and the 2021 GLC 300 delivers the high-end experience you expect. Luxury doesn’t have to come with a new-car price tag. Five years after it debuted, the 2021 Mercedes-Benz GLC 300 remains one of the more compelling used luxury SUVs on the market, combining refinement, strong performance and a pri…