Ms S which vet did you take her to? Many will negotiate a better price if you just ask, they will understand 8 vials without medical aid is pretty heavy for most to afford.
I moved my breeding rats and rabbits away from my house, we were finding too many mamba's and other snakes visiting. The aviary will be a snake magnet as well.
Good to hear your dog is fine and well, it's heartbreaking to watch a dog die that way. Good on you for going the extra mile.