Help save my boy Rampage

A couple of weeks ago i noticed a small lump on my boys paw. Didnt think anything of it at the time. Until a few days ago i noticed it had doubled in size and was open and all red. I took him straight to the vet and was told it was a tumour. Where it is situatuated on the inside of his paw. When operated on he will lose one of his toes. However if it spreads as quickly as it has been. It will be more than just his toe that needs to be cut off. He is my life. My boy. My best friend. He is the only one keeping me sane while ive been going through some shitty times. I would not do this unless it was a last resort. I just want my boy safe and healthy. With the surgery itself, the medication afterwards, the anaesthetic etc, i cant afford to help him :(

Any amount will help. No matter how big or small. Lets make my boy happy again! He struggles to put weight on his foot