I would not be certain that you cannot purchase from India. Elsewhere I mentioned that my supplier is not experiencing problems. I would be happy to share my source but it is referral only and I can be kicked off the approved list if I publish the contact.
Also, if you can find a US physician to write you a script – which can be easy depending on your circumstances – rapa is priced reasonably. GoodRx has an offer of 90, 1 mg sirolimus tabs for $72 and $194 for their regular price.
Yes - to add on to these previous responses, there are lots of doctors in the US prescribing rapamycin now, so check this list and see if any work for you: Rapamycin Prescription, Doctors that Prescribe It