Campus Bookstore: $449.50
Chegg.com (and Amazon): $254.59

A savings of:

43%

When you factor in the fact that the above is not apples-to-apples because Chegg does not stock two of the books I need, the savings is actually:

62.5%

One of the nice things about Chegg is how I know up-front what my net cost will be for books for the semester. It is the price I pay in August. If I deal with the campus bookstore, I learn nothing. I only know from previous experience that the best I can hope for is 40% of what I paid, and nothing if the publisher decided it was time for a new edition. Information makes markets work better.