One of my cousins studied at Maharaja Surajmal Institute of Technology (MSIT) and he never bought a single book for any branch.
You will get free access to all the books from the book bank. You will also get personal textbooks each semester as soon as you get your college IDs. There is an online portal available that helps in getting ideas about the books available in the book bank.
You will be required to pay for the book bank that has already been added to the college fee in the first year.
There is a book store outside of MSIT where students can buy books of Bhavya Publications which are easy to read and understand and written in simple language. It helps in scoring good marks in IPU.