A8 not even out in then UK and Samsung s9 hasn't been announced. So wether the phone made in Vietnam or not. I know few older models were put together Korea. Now production mostly moved to Vietnam.
Hope Flipkart comes up with some special offers on the launch. But i want Amazon India to take the lead.
Amazon India has been busy courting Samsung - for example, the On7 Prime is an Amazon exclusive, and the Note 8 was also formally sold via Amazon India, not Flipkart. So - like you - I would be curious to see if the S9 and S9+ land on both Amazon and Flipkart or not.