Can you rent your books? DS did that for 7 of his 8 semesters and pocketed a ton of money.
My kids never purchased books, UNLESS they could not find them on Chegg or AmazonPrime (rentals).
JMPO, but there is no reason to BUY a new textbook. My youngest was a bio-chem major carrying 18-21 credits per month, all math/science which is typically the high end for book costs. I don't think we ever went over 200 for a semester using Chegg or Amazon. It is super easy. You order the books, within 24-48 hrs they were at the door/mailbox. Yes you can highlight them like if you purchased. End of semester you download the return label and send the books back free of cost at your local UPS store
~ We always kept the box they sent them in for ease of shipping back.
~~ In our area Chegg is so big that the local UPS stores have a CHEGG banner by their door entrance.
Might be just me, but I wonder how long the college book store will last selling books. Personally, I think they will be there just for that freshmen experience.