In Canada:

University of Alberta Bookstore, Edmonton, Alberta
http://www.bookstore.ualberta.ca/

UBC Bookstore, Vancouver, British Columbia
http://www.bookstore.ubc.ca/

University of Calgary Bookstore, Calgary, Alberta
http://www.calgarybookstore.ca/

University of Manitoba Health Sciences Bookstore, Winnipeg, Manitoba
http://www.umanitoba.ca/campus/bookstore/

University of Saskatchewan Bookstore, Saskatoon, Saskatchewan
http://adminsrv.usask.ca/csd/BookWeb/

University of Toronto Bookstore, Toronto, Ontario
http://www.uoftbookstore.com/online/

University of Western Ontario - The Bookstore, London, Ontario
http://www.bookstore.uwo.ca/

In the USA:

University of California Los Angeles - UCLA BookZone, Los Angeles, California
http://www.collegestore.org/newbookzone/index.asp

University of Washington Bookstore, Seattle, Washington
http://www.bookstore.washington.edu/