A set of useful alternative package index mirrors?

Similar issue has been around for long and I cannot find a place where it shows what can be the alternative mirrors when s3 is not working well. Specifically, I was trying to download package index for the last 24 hours without managing it.

A couple of related issues are following:

https://github.com/commercialhaskell/stack/issues/1223
https://github.com/commercialhaskell/stack/issues/774
https://github.com/commercialhaskell/stack/issues/3088

So I am wondering if there is already a list of stable alternative mirrors which can be used already? I can only find such alternatives in github issues. Wouldn't it be a good idea to make it in documentation?

I cannot find such list in the documentation, my apologies if I looked over.