One of the best sites to buy books in India is bx-zone.com

From its books store you can buy books at discounts because it's a second hand bookstore where people list their old books for sale to people living around you.

It's a commission free website and is absolutely free to use.

There are many sites available to buy books in India.(including Amazon.in ) and i have tried many of them. The website that I personally liked the most is Snatch Books (www.snatchbooks.com). They provide second hand books at much lower price. I would recommend this especially if you are a college student and looking for cheaper options to purchase and rent books.

https://www.mynextbook.in/ - big collection of books to buy with free shipping