Help Me Decide

[Devildog1]

I have (2) bald front tires and (2) fairly new on the rear. Super Swamper TSL Radial 37x12.50R 16LT. Having a hard time finding the tires and the ones I found are about 420 each. Should I just get a whole new set but a different brand. Might be more cost efficient. Would like to keep the 37's but do I have to get 12.5's.

Thanks