Does anyone know...........

a website or shop in chch where I can buy formula cheaper than at supermarket? I don't mind if it has to be in bulk.
We are trying DS on goats milk and if it works will stick with it, but it is sooooooooooooooooooooooooooooooo expensive it is not even funny. Would be cheaper to buy a goat of our own, not sure how I would make formula though or whether I would have much joy trying to milk it by hand.
Told DH we will have to eat beans and toast, he said we can't afford the electricity and we will have to eat cold beans on bread