Yeah, $1200 is a typical tire shop price. Fair but not cheap. You can save a bit if you buy from Simple Tire and have them shipped to the shop, then pay the shop to balance & install. Probably save $100-$150, depending on what the shop charges for mount & balance. Or the shop might cut you a slightly better deal if you inquire about having them install a tire you buy elsewhere. It's worth a try.
https://simpletire.com/specialty-tires-of-america-8.0016.5lt-la4a5-tires
The tire price looks terrific, but by the time you add in FET & shipping, the difference is much smaller, and you still have to pay for mount & balance.
I priced buying big 22.5' Toyo tires for my coach this way and the savings amounted to only $12/tire by the time I got out the door. It wasn't worth the extra hassle for two tires, but might have been for 6.