Sterilization Vet Bill

I own 4 cats. 3 of them are female and 1 male. I want to sterilize them as 2 of them have already given birth (4 kittens and 3 kittens) that I plan to give up for adoption. My parents dont agree with the idea of sterilization and would rather give the kittens away claiming that they can survive on their own.

I dont want my cats to give birth to kittens who I cant assure them a great future life in a loving home. Id rather have sterilized.

Any help is greatly appreciated!! I myself am working and trying to gather some money for the operations.

The vet said that it will cost 90 for each female (90x3=270) and 60 for the male, total 330 euro.

Thanks everyone in advance and please sterilize your pets if you are not sure you can provide a safe home for their newborns.