Help BB Recover from Car Accident Injuries

Hello my name is Jordan Dunn, this is my cat BB he is 9-10 years old. On Wednesday evening he was hit by a car (I witnessed it ) I tried to catch him he ran off under an abandoned house. I check on him three times that night I couldn’t reach him but I could see him and he would move his head when I called his name. The next morning I went back to check on him and he was gone I could no longer see him idk if he may have moved further back or what but I often kept checking for him. I had help from neighbors that had set a trap with food and water and no luck I posted on Facebook incase someone had seen him or took him to the vet. Fast forward to Friday I called everywhere I could think of to get someone to go under the house to look for me. No one would do it. Saturday morning when I woke up he was in my porch. No longer fighting or running to get away from me. I picked him up put him in a kennel and went to the vet. Now I’m looking for a second opinion and need help with the cost of fees for any surgery or medication or and medical expenses for him. He is my other child and I would greatly appreciate everyone’s help including a share if possible .