How much is it to vet a free kitten?

I want to thank you for posting this. I have always been curious about the cost difference between adopting and finding a free kitty. My husband and I had long discussions before deciding where to go to get a cat. I always thought the $100 adoption fee seemed crazy, but it didn't matter when I found my Emmy and Katie cat. I would have paid more for them. I had no idea of what the vet costs would be.