There is no list of approved vendors. When sending books to an inmate in the Arizona Department of Corrections the two things to keep in mind are, 1) The items need to come directly from the company you order them from, and not through a third party vendor. 2) There needs to be a packing slip included in the package. As long as those two things are in place, the inmate should be able to receive the package. Some of the vendors you can go through to send books are Barnes and Noble.com, Target.com and Walmart.com.
Sincerely,
Lisa Cooper
Constituent Services Liaison
Arizona Department of Corrections
602-364-3945
(this is an email I received today from the Arizona Doc dept. Although there is still no guarantee the book will not be rejected).