My bunnies are sick but we can't afford the vet

3 of my baby bunnies have already passed away and we don't know what's wrong with them. My mom says we can't afford to take them to the vet. I just need a bit of money for vet fees, anything would be helpful, I'm worried about how much longer the 4 left will last ❤️ we also have to start paying for formula because we are pretty sure the mother stopped feeding them. And I have to have a big enough cage for them when theyre old enough