There are likely free sources out there, perhaps at the Alberta and Saskatchewan government websites. However I know of at least two companies who will probably sell this to you (maybe you can work out a free deal depending on how it will be used).
Try:
Veritas DGC http://www.veritasdgc.com/bins/content_page.asp?cid=5-3215-408-1968
Divestco
http://www.divestco.com/html/solutions_data.php?select=customdatalayers#