Where can I get a starting point for value of my '72 Commando Roadster? Or anyone have a ballpark figure for me? Am getting ready to sell, but don't have a very good idea of its market value. Have had the bike since '73, has 15,300 miles. Unfortunately has the fiberglass tank, but no leaks. Is close to needing brakes (drums, a build date of July 1971), needs a muffler on one side. Runs well, looks good. Thanks for the guidance.