Certainly a good idea to do some searching for possible free spay/neuter clinics. Call all the rescue groups in your area, and explain the situation. With luck you'll find a group that will have either low cost, or free for ferals. I'm tackling a colony tomorrow and having only 4 slots for the clinic on Sun. I'm going to have to trap only pregnant females by using a rope to control the trap door. Fun, fun, fun, and it's going to be pouring out. I've managed to get a number of kitties into these vrious clinics, and the best part is they're FREE! Be sure the cats are eartipped so you can tell which cat's been done, and which isn't.