Help with Mollies expensive surgery

My 8 month old puppy has patellar subluxation in both of her back legs and is in desperate need of surgery to fix the problem. She is in a lot of pain and has trouble walking. When she is not laying in her bed trying not to move, she is limping around the house. She is at stage 3 of 4 stages, 4 being the worst stage of Patella subluxation. The vet has quoted me for $1500.00 per leg. If I cant raise the money to get her the surgery needed, I will have to put her down. I cant watch this poor puppy suffer much longer. Any amount money would help. Thank you very much.