I have sold mine (1975, though) for $5k last year. There was one available a few months ago for $1k (sic!), but only to good hands.
There are a few around for anywhere from $3500 to $8000.
Btw. I don't think C&C was making the 24 in 1984. But the hull number would tell you the details.
I don't think there is a "store" that supplies C&C parts. Check Holland Marine out of Hamilton, ON. They still store some C&C parts. (
www.hollandmarine.com/Main.html).
And check cncphotoalbum.com for any technical information you may need.