Most locations do not limit the number of books or magazines an inmate may receive. As long as you are using the Amazon corporate website purchase and not one of their third-party affiliate sellers. They are mixed in the site offering lower priced used books that will definitely get rejected. Amazon can get the paperback books delivered because they are a recognized "publisher".
https://www.inmateaid.com/ask-the-inmate/is-there-a-limit-on-how-many-books-i-send-my-inmate-from-amazon-i-wanted-to-send-him-a-5-book-series-and-a-dictionary#answer
Accepted Answer Date Created: March 08,2015