Note – This is Only for Indians.
When OnePlus launch new Mobilephone they reduce the price of their First mobile.
Same thing OnePlus did with OnePlus 6 because OnePlus 6T is near to launch. So, they Give OnePlus 6 in Sale. The original price of OnePlus 6 is 35,000 INR but in this Amazon Sale, it will be available in 30,000. This sale is started from 10 October on Amazon.
But in my opinion, you shouldn’t buy OnePlus 6 now. Because OnePlus Support this mobile approximately 6 month more. And after that No support & No Updates for OnePlus 6.
If you Only buy OnePlus then wait for OnePlus 6T and don’t buy OnePlus 6 Now.