Those prices seem fair to me. I deducted 10% off the keh prices for the 50mm and 300mm. I deducted a little more off the 105mm since mine is not the D version but still is in excellent condition. Prices are in US dollars.
AF 50mm f1.4D - 250$ w/ Nikon UV filter AF 105mm f2.8 - 550$ w/ Nikon UV filter AF 300mm f4 - 540$ w/ Tiffen Skylight filter
Email me if interested in one or more of these lenses.