Low Cost Pet Clinic Near South Gate California?

We have a dog named Kenny. My son brought him home (it was given to him) 2yrs ago. When he first got him we noticed a hanging foreskin on the bottom of his stomach, which we were told it was a cyst. Well last week my son took him to a vet (clinic) because it had grown bigger with blisters and they told us he has a tumor. We need a low cost or free clinic we can go to. This is our very first dog and we don't want to lose him. Can anyone help with suggestions?

By catalina from South Gate, CA