The availability of review copies varies by university publishing group. Some university publishers offer review copies freely, while others only waive the cost if you either return the book or actually adopt it in your course. Pay careful attention to the instructions and disclaimers on each university publisher website.
Below is a list of some major academic publishers that offer exam or review copies:
Stanford University Press: https://www.sup.org/requests/?item=examcopy
Cambridge University Press: https://www.cambridge.org/us/academic/textbooks
Duke University Press: https://www.dukeupress.edu/Information-For/Educators/Desk-and-Exam-Copies
Harvard University Press: https://www.hup.harvard.edu/resources/educators/examination-copies.html
Oxford University Press: https://global.oup.com/academic/help/examination-copy/?cc=us&lang=en&
University of Chicago Press: https://press.uchicago.edu/books/instructors.html#desk
Yale University Press: https://yalebooks.yale.edu/examination-desk-copies
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