I will admit that in Tennessee the Coop may have the biggest market for tractor tires. That being said most tire stores like Firestone, Goodyear and other chains may carry tractor tires. I would prefer to buy from one that sold and installed but installing tractor tires may not always be offered. Some would sell the tire and let you carry to an independant installer and others may sell the tire and have a contract installer put it on for you. I would guess you just have to call around and see. Look for someone that has a service truck and will come to you, rather than you having to bring tractor to them. May cost extra but is likely worth it. Good Luck!
Phil in Tupelo