Where can I get the value for collectible bicycles?

I have an old Schwinn banana bike, made in Chicago, with all the original equipment on it. It is in very good condition with just a few scratches. ( I don’t know if the tires are original).

My kids rode it but the youngest is 19 now and stopped riding it when he was around 12.

I want to get an approximate value for the bike. It is time to clear out a lot of old stuff in the garage and we might have a tag sale in the spring.

Thanks