A local antique mall has a bunch of old tricycles they just got in. A few are chain drive, but not complete, so it would take two to make a complete one. They are all in rough, rusty condition, but most are salvageable. Any idea on what they might be worth? I don't have a need for one, but I will probably have grandkids in the next 5-10 years, so I thought it could be a fun project.