Some folks buy from alldaychemist.com in India. They buy the 3 drugs seperately—ICS, LAMA and LABA.
I purchased from them once over a decade ago and the medication worked ok for me. This isn’t an endorsement but it is what other folks I know have done to get the medications they need at a price they can afford.

They generally buy 6 month supply at a time, as it can take awhile to get it.