Would you try fostering some "kittehs" for the SPCA? I know it's heart-breaking to give them back, but you know you have done something good. They supply everything you need - cages, food, litter, litter trays, veterinary attention etc.
I fostered two, and I still remember them fondly. It broke my heart to give them back, but still, I'm glad I'm did it and do consider fostering some more, at some time in the future, if I can get around to it.