Online retailers Flipkart, Amazon, Snapdeal and ShopClues are set to begin their festive sale from October this year. While Flipkart's Big Billion Day and Snapdeal's Unbox Diwali sale will be held from October 2-6, Amazon's Great Indian Festival sale will take place from October 1-5. In October 2015, online retailers did business worth nearly ₹9,000 crore.