I agree with the others who have suggested charging a fee and I'm glad to hear you have the funds to spay/neuter your foster babies.

Kimlovescats I really commend you on a fantastic job you are doing in helping these precious kitties. Hats off to you girl. Believe me I would be doing the same if I had the means and the finances.
Congratulations to you kimlovescats, keep up the good work.