Raising money to get strays fixed

I'm raising money to help spay and neuter the strays that keep showing up at my home. The Cat Distribution System seems to think I have gone long enough without any cats in my life and keeps sending them to me now Currently I am raising money to neuter a male black cat, who we are calling Mr. Mysterious. We will also be raising money for a white and orange female named Polly to be spayed. Both cats will be available for adoption once they are fixed and up to dates on their shots. Mr. Mysterious is a young black male that seems to have followed me home one night. He appeared under my car, cold and crying. I brought him into my enclosed porch and gave him food, water and shelter from the cold temperatures that night. He was very timid and hid the whole time, while still crying when he heard anyone. We tried to locate his owners and no one has claimed him, he keeps coming back to our house every night and cries to let us know he is here. I believe he is from a feral colony nearby. He allows me to pet him briefly now, but runs away if I move too fast. Polly is a cream orange and white female that showed up at my brother's house and would not leave. She was super skinny and dirty when they found her. She is extremely friendly, loves sleeping next to (or on) you, gets along great with dogs, but appears to hate other cats. When she is ready to go to a new home she will need to be the only cat.