A tough spot to be in. I knew eventually you would be faced with something like this. I contributed to a HMO where I used to work where 3 kittens would beg the night guard for food...and so I started donating bags of kibble. Within a year there were over 20 of them coming to the back door!

I know the owner where I got Weezie catches them sometimes and neuters them. And then lets them back out. The owner said here at Mich State Univ Vet school will spay cats brought to them for very small fees...as a learning situation for the students. She offered free spay for her kittens, but I declined, and said I could take care of that for Weezie.

Our Tippy who passed recently was from a farm, where a lady
caught the pregnant females, raised the litter in her garage, and neutered the mother and released her back after the kittens were adopted out.

If you have financial problems, this could be a big problem for you. Perhaps you could ask around at the church you attend to see if any of your members could help you with this? As a financial gift to the community, etc?