Ok, new problem. (old problem I thought I'd leave for down the road)

I have looked into the tire situation. I have found one shop that is willing to work on 2 piece wheels. I am not sure if they're in great shape or not but, they hold air, at
least the tubes do. The rubber is another story, dry rot everywhere. I know that I need 8 new tires.

Could anyone suggest a good place to start looking? Is there an aftermarket
for replacement wheels?