Flipkart is selling Mi power banks at cheapest rate. You will get 10,400 mAH model at 999 rs and 5200 mAH at 599 rs.
At this moment, 10,400 version is available for 1299 rs on eBay and snapdeal. So you can save approximately 300 rs from Flipkart.
Click here to buy 5200 mAh power bank.
Click here for 10,400 mAh version.