It varies from model year to model year. It varies even more widely from dealership to dealership. I've seen it as high as $600-$700 on older models. $300-$400 on newer models. If you have multiple dealers in your local area, you might want to check with all of them. There was a $200 difference between two Lincoln Dealers in my area.New here. On our 6th MKZ, wife loves the car. I need a 2nd key, does anyone know the cost of a new key at a dealership?