Used price for steel tubeless big truck wheels, is usually around $50 each, depending what it is and where you are, that sounds fair to me, I would not pay much more unless they came with inspectable tires, then around about $100 each.
For new prices you will need to go to your local big truck tire shop and ask them to check the price on that part number.
Those wheels may not be extremely easy to find used, but I would say not difficult. I have seen a number of trucks with that size bolt pattern 22.5 wheels.
Grigg
