I did the spay voucher for Kasha. It was 75 for her ( less for boys I think) but we had to look around at all the vets to make sure they were ok. It so happened that the one who spayed her I absolutely LOVED! She is doing great and it was so much better than the 450 we were quoted for her since we had 8 teeth pulled anyways.
to spay vouchers just do your research & ask around about the vet you use.