What size do you need?
There are several sets on ebay.
35/1250/18
37x1350x20
35/1250/17
35/1250/20
They are pricey, but available. I just picked up a set of 4 slightly used 90% tread Toyo M/T 37x1350x22 for $1k shipped off there. I lucked up and found a new 5th tire in FL for about $500 shipped. The tires have been backordered at many places since November of last year. Anyways, good luck.