I'm running used 9R22.5 tires now, because the price was right. I have some nearly new fronts, and about 30% left on the rears, as soon as I find some traction tires I'll switch the rears out. Or if I wear out the rears first I'll probably buy new ones.

Your used tire prices sound reasonable if they are close by, and the fronts should be realy nice looking for that price.
If I personally needed rear tires badly I would take a look at the 50% G159's, they are supposed to be nice tires, and about as rough as you will find in 9R22.5

Also, if these tires are for your 57, do you have tubeless rims for it? I'll assume you already know, but for others who may be confused, 22.5" tires only go on 22.5" rims, and same goes for any and all the other tire sizes.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-