Does anyone know where I can get a decent bench seat for cheap for my 1984 F250?
Generally an auto junk yard would be the place to look but finding a 1984 F250 truck in a junk yard will probably not happen.
You can place wanted ads in Nextdoor.com, Freecycle, Craigslist and other sites but what you really need to know is what model trucks have the same size seats so you can look for more than one model truck.
You can ask this question at some of your auto parts stores as some of them still sell seats - usually ordered.
Some truck repair shops might be able to help you - especially the shops that do accident repair work.
Ford dealership may be able to help you even if it's just providing 'generic' seats.
There a lot of truck forums that help with things like this so maybe join and ask:
It's a long shot but here are some ideas:
Ebay has one for sale right now: www.ebay.com/
I hope you find the bench you're looking for! Good luck!
You could check car salvage yards in your area, You can also check with Ford dealership , for where they send there cars that are traded in or auctioned. Going to a acution offen times you can get a truck for the parts. Put in car auctions , along with your zip code ,for the closest and next auction.
I would go to an auto body shop. They usually have connections to all kinds of parts.