The cheapest way out will be to look for wheels that have your lug pattern and center hole size, anything other than that and you will be jumping down the rabbit hole into the unknown.
There are 20" 2-piece lock ring wheels out there that are 10-lug with the 4.75" center hole (still legal and safe to run), but you'll need to search for them in old barns or private junk yards. Advertising here is a good start!
Mike B
