Those are pretty standard older bikes other than the one with the bannana seat. Does it say "Schwinn Stingray" on the other side of the chain guard or say "Schwinn" anywhere else on the bike? I've seen them go up to $700 when original Schwinn Stingrays have been rebuilt and reconditioned. While I'm not an expert, I don't think I've seen those style of handlebars on a Schwinn bike before - they are too angled, so that may be a replacement.
Re: Schwinn bikes
Those are pretty standard older bikes other than the one with the bannana seat. Does it say "Schwinn Stingray" on the other side of the chain guard or say "Schwinn" anywhere else on the bike? I've seen them go up to $700 when original Schwinn Stingrays have been rebuilt and reconditioned. While I'm not an expert, I don't think I've seen those style of handlebars on a Schwinn bike before - they are too angled, so that may be a replacement.