Emergency vet Help

Our baby Bear kitty snuck out while we were going outside to the car... hes not an outdoor cat. He was hit or fell out of a tree... theres no external blood but his leg is broken he screams so loud when we move that limb but not the other limbs.. We need to go to Portland emergency vet. Its going to be 400-600 ish $

We dont get paid until Tuesday and we need to go to the vet now. I really could use some help. I can pay people back.