Depends on if they are projects, generally working but needing shopping out, restored, high end restored.
Lots of variables.
I do know a Quicksilver in Maine with blown out playfield, not working and needing lots of love went for $3k for reference.
Quicksilver and Stargazer command slightly more than a Seawitch as they made less of them and they both are slightly better players than Seawitch.
Quoted from Mitch:Dont see these come up too often. What's the going price for these titles.
Quicksilver, stargazer, seawitch