I found a 1977 Dodge Monaco in Massachusetts for $9,999:
https://www.cars.com/vehicledetail/9a5e067d-4960-4151-9da1-97cd8cb1317d/?aff=atempest&utm_campaign=atempest&utm_source=autotempest&utm_medium=trp&utm_campaign_id=1&utm_trusted=TRUE
I originally used autotempest.com to start my search. The only Plymouth Fury in the right age range that I could find was a relatively expensive 2-door model.