Thanks for getting the word out. I have rescued 12 feral cats. The first one I had fixed cost $290. A friend told me about the MARX program (Managing Animal Reproduction without Extremes). It costs $39 for males and $52 for females. The vet in my town that participates in the program is wonderful. He works with me and doesn't complain when I have a cat scheduled and can't catch her. He just cancels the surgery and reschedules! Once I caught 3 at once, so he did all their surgeries on the same day. Check the internet for your state and see who participates near you.
I have the latest mama cat scheduled for Friday, hope I can catch her. Her 4 kittens are now about 8 weeks old, so this fall, I will be at it again until they are all fixed. Twelve is my limit, though, even if they are all outside cats but one (inside due to medical issues). It is sooooo expensive to feed them!
I didn't think I would have a cat "problem" when we moved to the country down a quarter mile lane. I think my address must be on some sort of cat underground newsletter...