If you have a truck and someone to help you load it, Facebook marketplace is the ticket for those big, bulky, low $ used items. Lots of "get it outta my sight" type attitudes towards appliances. People who see the old appliance as just some gigantic thing that has to get down the steps and be hauled away in a truck or van they don't have, and Facebook marketplace is their solution in a few taps of their phone.
That said, upright all freezer or all fridge is a more desirable item... if you want cheap you'll probably end up with the horizontal freezer.