My 4 month old kitten needs surgery

We found two kittens in our apartment complex. We dont know where they came from or who they belong two. Its been 2 months now and we have grown to love them. Our boy Axel needs emergency surgery, turns out he previously ate a hair tie and is causing a major blockage.

My girlfriend lost her job just last month and we have nothing left. If our baby boy doesnt receive the surgery, he will not make it. He has so much life ahead of him and i cant watch such a simple thing take the life of our new family member.

Please help.