Best thing to do is see what Sunfish are going for on Craigslist
in your area. I can pretty much say you'll find anything from
free to about $600. This is stock condition without racing sail, racing dagger board
or rudder. Assuming old style rudder maybe $150 less or cost of upgrade.
Buyers market in the fall, Sellers market in the spring.
Their best value is just Fun. You can always set the selling price at $600
and work it down every two weeks until you start to hit market value.