Isabella Emergency Surgery

My baby cat, She wasn't eating and having issues with using her litterbox, so I brought her to the vet. Unfortunately she needs emergency surgery. It's very unexpected as she has always been healthy. She is having her apendix removed and tested for cancer.  

I just don't have all the money to pay for the surgery. I already put $400 down, I really need to just come up with the rest and any help will be greatly appriciated. Thanks for any help you can give