You will need both the textbook, and a lot of paper for notes, homework, and scrap paper.
Textbook: Linear Algebra and its Applications by Lay, Lay, and McDonald.
You can buy any edition of the book. The newest edition is available in the bookstore. You can order old editions online at Amazon: 4th Edition, 5th Edition, etc.
Again, I will not need the online access code, and I will not assign problems based on the numbers at the end of the book, so you may buy a (slightly) earlier edition. But I will expect that you are reading along in the book, and using it for extra practice.