All of mine were trapped right on my street. They each cost about $135 for all the medical care----spay or neuter, shots, de-fleaing, and a couple had abcesses. After a year, 2 developed UTI's. Fortunately, not at the same time.

If you adopt from a shelter (Please do!) the cat should have been seen by a vet before adoption. Their health isn't guaranteed, but the shelter should have some idea if the cat is relatively healthy. An older kitten or cat would have more history to go by.

Good luck!

Mary