Best place between Atlanta & Tampa to buy used tire 9RX22.5

No idea how much from a merchant but in the size range listed a retread is probably going to be easier to find than used with tread remaining.

And for what it's worth just as a potential example my local Craig's List has a seller with a set of Michelin 235/80 R22.5 XRV for $95 each.

I got my tires for my 40' Class A at Crawford Tire in Ocoee Florida near Winter Garden. They are a few minutes off the Florida Turnpike. They must of had 500 old truck tires around the shop. My 275/70-22.5 sumitomo tires were $2,300 mounted and balanced out the door.

https://www.crawfordtireservice.com/