Are you a first year? Do you want to purchase some used textbooks and maybe save some money? If you answer yes to both questions, then be sure to check this facebook group (McMaster 2014):
http://www.facebook.com/home.php?sk=...332 735587904
where upper years students like me are selling their textbooks

You can use this site too! http://www.macinsiders.com/forumdisp...191.html?f=191