the Library, the Atrium, and the Den in McNally East for 41¢ a page single or double sided (for students, staff and faculty only) More info about printing from computer labs can be found here.
The Bookstore has printing options as well. They can be found here.
Not far from campus, at 1083 Queen Street, the UPS store offers printing services. You can email your document, with instructions. Cost is $1.30 per page for one page. High quantities can cost less.