Rescued Cats

My husband and I have been rescuing sick kittens since 2007.  We live on a dead end road and people are always dropping animals off.  Once the kittens were well, we tried to find a good home for them.  No one wanted a kitten.  We now have too many cats inside and we cannot afford the upkeep and veterinary care that they need.  Right now we have six cats that need vet care and we do not have the money.  We are both retired and on a fixed income.  Any help would be greatly appreciated so the cats can have a better quality of life.   Our cats thank you.  The cats in the picture are just some of our rescues.