Flipkart Big Billion Day Sale : India Biggest Sale is back ! Big Billion Days 2016- No Cost EMI, Exchange old products with new , Deals on top wishlisted Products .Wish karo India ! It’s back! And it’s bigger than ever! Break into your savings because the right time to shop is now. Spanning 5 days (2nd to 6th October), this year’s ‘The Big Billion Days’ is your chance to go all out.