I don't know what they go for used, but I know what a shop wants to quote a new one at from Ford. I just had an estimate done for the damage on my 95, and a stock hood goes for $650. Hope that helps. It has helped me decide that I am getting a fiberglass hood, lol.
These are highly engineered precision vehicles, the first step in diagnosing the problem is to strike the suspected offending part sharply and repeatedly with a blunt object, then re-test.