First off let me hit you with this: .
What do I keep saying about open source text books? They are the wave of the future. There are many cases for them including the fact that the knowledge in all text books is basically the same, (for math, english and history, it generally does not change), text books from major publishers are expensive (and schools are seeing their funding cut left and right) and they are copywritten for some reason (how do you copywrite addition, grammar and a year of the past?)
Here we have Open Stax an inititive of Rice University (the Ivy League of the South):

OpenStax College is a nonprofit organization committed to improving student access to quality learning materials. Our free textbooks are developed and peer-reviewed by educators to ensure they are readable, accurate, and meet the scope and sequence requirements of your course. Through our partnerships with companies and foundations committed to reducing costs for students, OpenStax College is working to improve access to higher education for all.

OpenStax College is an initiative of Rice University and is made possible through the generous support of several philanthropic foundations.

Psychology, Physics, Biology, Economics, Pre-Calculus to name a few. All Free all accessible. All students should at least give it a look to see if they can benefit from it in their current situation or future education, I shall be adding them to my personal collection of knowledge.