Argentina is now the cheapest for Youtube Premium (a few pence cheaper than India). VPN will be required. Signing up is an easy process.
1) Start up a VPN that offers locations in India (eg hide.me)
2) Browse to youtube.com/pre…ium
and start adding subscription
3) When entering payment details, enter Argentina as your billing country (their system doesn't seem to check for validity)Credit to Gee3000 for instructions.