Other than discounts, most of the sites are offering additional products to lure buyers.
Government seeks stakeholders' comments by Jan 30 on discussion paper.
At Rs 20,000 crore (Rs 200 billion), e-commerce has seen one of the fastest rates of growth in investment activity this year.
With the festive season underway, retailers in the online and the offline world need to prepare well to offer the best deals to consumers and earn trust.