Retail in Canada
Scholar's Choice - a chain of stores across Canada that offer a great variety of materials. www.scholarschoice.ca will even tell you where the stores are located and what's available!

Chapters, Indigo, Coles, etc
www.chapters.indigo.ca/ ya gotta know a name, here! Everything from picture/board books to encyclopedias to foreign languages!

Staples/Business Depot - www.staples.ca - lot's of 'back to school' supplies at great prices, plus they do carry some elementary grade workbooks and a huge selection of educational software for any grade level.

Large department stores, such as Zellers and Walmart and places like Costco also carry a line of elementary grade workbooks as well as offering good/great prices on those 'back to school' items. They also offer great educational tools, such as LeapPad, VTech educational 'toys', etc.