Your impatience aside, it is not possible to buy any prescription drug without a prescription. Unless you find a doctor to prescribe Ferriprox, you won't be able to try it and doctors in the US tend to be slow about prescribing Ferriprox because it once had an undeserved bad reputation, due to the actions of one doctor who successfully passed herself off as a martyr for many years.
What are you currently using to chelate, what is your weight and the chelator dose and what type of side effects are you having?