My son buys all of his books online an it is ridiculously cheaper than the campus bookstore.
My son rented/leased many of his text books. I believe it was through Amazon.
It was even cheaper than buying.
It is not like you are going to keep these books.
The only books I ever kept were specific wood technology books. Dendrology. Wood frame Construction. Simplified Design of Structural Wood. I still have these 35 years later.