Your main textbook is available for free online. You can find all of the chapters individually or you can download a PDF of both volumes on this website:

Writing Spaces

Both volumes are also available for purchase via hard copy here:

Writing Spaces, Vol. 1

Writing Spaces, Vol. 2

You will also need Diana Hacker's A Writer's Reference.  You can purchase used copies of the 7th edition as of this last fall, or new copies of the 8th edition (if you can find used copies of 8th, that works too).  This is a handbook that is commonly used in many UAF writing classes, so it might be worth it to keep a copy after the semester is over. You will NEED it for this course and for your next writing course. It is available for purchase both online and in hard copy.