Hi there,
Reading book is a great source of knowledge & a great hobby to pursue. It not only provide you k nowledge, but also enhances your cognitive powers. It is the best utilization of time that one can make of & having a knowledge make you look smarter & you stand out in crowd.
The cheapest way to get books is to borrow from your seniors, and there are lot of books in pdf format are available over internet. One can also buy refurbished boooks at a lower price.
Hope this helps.
Best Wishes.