Please help me save my furry friend Alfie

My name is Crystal and I need to save my best friend. Alfie is 3 years old and should have a long life to live. Unfortunately within a week he became unwell, unable to pee and couldn't hold down his food. He's been diagnosed with a urinary blockage in simplest terms. Treatment will most likely be surgery to give him the best fighting chance. Money has become hard for me as I've become a single mom for the time being. My cat is my family and I need to give him a fighting chance. He deserves it. Surgery costs range anywhere from $2000- $4000. I can come up with a portion of that bill but I can't afford the entire bill upfront. Please help save Alfie. He's got a family that loves him and needs him. Thank you.