We know that online shopping in India has increased widely and according to the online database 40 million people has shopped in 2016 till now, and it will be increased by 200% in upcoming 2 to 4 year.
And the biggest online retailer in India - Amazon, Flipkart, Snapdeal, and eBay, etc. where you can not only purchase the product but also sell your new (and used on eBay) products by paying some small charges.
For online shopping purpose, I use buyhatke chrome extension to compare the same products with multiple shopping sites to save some extra money.
But, it is not possible to stay online every time with the desktop to track price drop. So for this purpose, I have created a Tasker profile which directly grab the price of the product from eBay store and display the same on my Android notification area. So that whenever price will drop or maximum and within my budget then I will purchase the product.