Medical tourism is a growing industry and I would look very closely at any clinics or doctors involved. Have you thought about building a campaign on a website like Kickstarter? There are websites which allow you to raise funds for all sorts of things. When I was a patient at M.D. Anderson I opted not to have a bone marrow transplant. It seemed very scary to me at the time. Perhaps you can contact them and find out if there are any studies for your niece. Don't give up on finding a solution here in the U.S. I think shopping around for the cheapest bone marrow transplant is very risky. Be careful.