You will need both the textbook, and a lot of paper for notes, homework, and scrap paper.
Textbook: Linear Algebra and its Applications, 5th edition by Lay, Lay, and McDonald.
You can buy the book in the bookstore, or order it online at amazon.com or some other seller for a much lower price.
We will not need the online access code, so you may purchase a used book.
I will not assign problems based on the numbers at the end of the book, so you may buy a (slightly) earlier edition.