For the animal itself or the vet trip to get shots/fixed?
I'm assuming the animal itself, if so it's basically two litter of cats for free. Ofcourse "free" also cost like 400 something dollars for spay/neuter and shots for one. Might wonder how one adopts an entire litter of cats twice. The mother cat decides she's going to deploy them like a landing craft during a beach assault and you're overwhelmed by cuteness.