I would recommend that you take your child to St Jude hopspital in Tennessee. According to their website: "St. Jude is the only pediatric cancer research center where families never pay for treatment not covered by insurance. No child is ever denied treatment because of the family's inability to pay." You can check out their website at:
Best wishes! I know firsthand how difficult it is to have a child who is facing a terminal illness, as well as the incredibly difficulty of experiencing the loss of a child due to that illness. I hope that you are able to find a way to receive the services your son requires. There is help out there without the need to solicit strangers for a dollar!
Bless your son!