Tire question Again

I was told today by a Good Year dealer & Michelin dealer that my size tires are only made by Michelin. The size is 235/80 R22.5 XRV
Also they won't be able to get them till around the first of June. Tried 2 other dealers got the same story.
What other tire is very close to the same tire ?
Price will be $489.00 each plus mounting, balance & Taxes.
Tires are for a 06 Winnebago Adventure,