Hi,
Flipkart has been developed over the years. If you compare 2007's version and current Flipkart's version, then you shall see hell and heaven difference. Thus, making flipkart's initial days model wouldn't take much time where the company initially focused on book sales, before expanding into other product categories such as consumer electronics, fashion, and lifestyle products.
Let me know the modules you need.
It could get more than 75 Lacs INR to 1 Crore, if comes to development from scratch.
Regards,
Mit-