PCPP for India only pulls from Amazon. Yes, sometimes the prices are skewed a bit (ie the 1070TI shows at 39000 via PCPP, but 55000 on Amazon).
That's pretty typical for all PCPP sites though, not exclusive to the Indian 'site'.
The OP used PCPP, it seems logical to continue to use it, no? While there may be regional availability differences, without knowing specific where the OP will be shopping, we're pretty limited in what we can do/link.
As for EVGA, as confirmed by EVGA here:
Hello,
Our warranty does indeed include global coverage. India is supported by our EU team and the warranty terms are at
http://eu.evga.com/support/warranty
The shipping location is determined by the EU team at the time of RMA but it will either be to Germany or Taiwan.
https://forums.evga.com/EVGA-WARRANTY-SUPPORT-IN-INDIA-m2588406.aspx
Warranty is worldwide, and applies in India also.
While yes, there's no official retailers, Amazon is selling/shipping from the US - and are an authorized retailer there.... so warranty would apply.
AFAIK, Gigabyte are the only GPU vendor with service centers in India. In my experience, their customer service/warranty isn't the greatest anyway, so locality may not matter in the event you need to file a claim.
At least EVGA's warranty service (and "step up" program) is solid and, generally, reliable