check around there are places that do low cost spay/neutering and first shot.
we go our ferral turned adopted kitten spayed and first shots at SPOT (Stop Pet Overpopulation Today ...
http://www.spotusa.org/
It was only $40 for all of it. She was only 10 weeks old so we couldn't get her rabies at the same time so we had to pay more for 2nd shots and rabies