oh how awful for you!
Well, I don't know what state your in but in new england we use "Friends of Animals" or we go through stray orgs. that have discounts through vets. But when you're dealing with a large population, it can still be so expensive. Esp because you're gonna test 1st (where I live used to be $15.00 and is now $25.00 with discount!). If they are positive, well, there's a whole other story- can't put them back ya know..
But if neg-can just test a few to know if the colony is healthy then tell the vet, no more testing, the colony is clean).
The lowest I've seen out here is $45.00 for a spay and $35.00 for a nueter. And they keep going up... Jan does her own distempers vaccines and through the discount for the vet to do it (last I heard) $10.00 and rabies about the same. So it's a lot but.. Imagine all the babies you'll be seeing and by the time mum brings them around, too feral to adopt out and they too will breed.. Well, you know how it can get, I don't need to say! If you need to do fund raising, is it possible to do it through Pet Talk or is that forbidden!? I would gladly help...Get some trappers lined up-people who know how to do it right (like, you do NOT trap a female without knowing whether or not she's nursing- seen trappers bungle that up! all you have to do is put catnip down, at night, then shine a flashlight on the belly to see if nipples are wet or if fur is separated from nursing- even then, best to pull for milk when she's in the trap to make sure- any nursing mom should be released to get back to her hidden babies- but I'm way ahead of the game here aren't I? let me know how I and others can help?!