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I purchased Biocon sirolimus and had it lab tested at valisure.com - and the batch I purchased seemed to be of lower quality than the Zydus sirolimus batch I purchased. I"Ve done this a few times. If you buy biocon sirolimus have it lab tested for purity and dosage... actually do this for any drugs from India. https://www.npr.org/sections/health-shots/2019/05/16/723545864/the-generic-drugs-youre-taking-may-not-be-as-safe-or-effective-as-you-think
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I just search for sirolimus on Indiamart.com - there are lots of vendors there. Availability comes and goes depending on their stock, etc. No prescription required. Cost about $1 to $1.25 per 1mg tablet. They've all been very reliable in terms of shipping the product to the USA within 2 to 3 weeks. I've never had any issues with customs, etc.