Try calling around to local salvage yards to find a 16" wheel from a 6 lug Isuzu, Toyota, Nissan, Honda Passport...you get the idea.
If you bring a jack & lug wrench, you can probably try it on before you buy, to make sure it clears the center hub/caliper etc.
Then start calling tire stores to find a used 285/75 x 16" tire.
I was able to score a Passport alloy wheel for $25. & a used tire for $20.