How much is an RSPCA kitten?

Our cats are from the Cats Protection League. It was suggested we make a donation of a minimum of �20 each cat and had to sign up to get them 'done' when they reached a certain age. I would much prefer to save a life so good for you wanting to do the same. We were checked to see if we had a garden, other pets, kids, etc - basically just what we could offer for a kitten. Good luck.