The schwinn varsity and continentals remind me a bit of the Peugeot UO 8s. They are basic bikes (the UO 8 is svelte compared to a varsity or a continental but the Schwinn is more bulletproof). A ton of those bikes (varsity, continentals, and UO8s) were sold during the boom era and their prices tend to range from $50 at the bottom end to whatever the seller thinks he or she can get at the upper end.

Anywhere between $50-$100 is an OK price on these bikes but I'd consider paying more for a clean example in a color I really liked.