https://www.insidehighered.com/news/2017/11/07/inclusive-acc...
More recently I was required to purchase an ebook that included online tests and homework hosted by the publisher. There is no 3rd party marketplace for that content. There is no way to get a refund if you do not use it. Publishers are allowing professors to outsource basically all of their lesson planning and content development responsibilities and pass the cost off to students. To add insult to injury, that product is setup to allow each institution to be the sole distributor of the license to their students and charge an additional markup to mail you a physical card containing the product activation code and offer no digital delivery option.