You SHOULD give the rings to the guy who bought the gun. They do come with them from the factory right?
As to the scope the response you've gotten is dead on. I've NEVER paid more than $125 used for one or sold one for more either. I've bought and sold a bunch of them. Often find them at gunshows almost as new for $100-120. Some folks ask as much as $150 but I've never seen one sell for that yet.
GB