We will be using a free online textbook this Fall in Math 369! The title of this book is A First Course in Linear Algebra, and it was written (or at least begun) by Robert Beezer at University of Puget Sound.
To access an online version of the book (in pdf format), go here. For more background information about the book and how it has been created, go here.
If you really want a print copy of the book (which is understandable), please note that it is over 900 pages long! Lulu sells a bound copy of this book for around \$25. Check Lulu out here.
If you have any trouble accessing this book whatsoever, please contact me immediately.