I would wait until the first class and see, because if you check the latest course outline for Psych 1X03 , it says that:
"Your course textbook can be purchased as an e-book that contains essential readings with testable material for the course." (It also provides a link for the e-book, but the link doesn't work. >.<)
Whereas, in previous years, the outline actually stated that the textbook was optional!
Here's the link for the new outline:
http://www.intropsych.net/images/sto...ll_2010-11.pdf