Ice wine, a very sweet dessert wine made from frozen grapes is a Canadian specialty, with products made by Inniskillin vinery in particular found at airport duty-free stores around the world. However, due to the tiny yields it's relatively expensive, with half-bottles (375 ml / 13 fl oz) starting at $50.
Maple syrup is always the best choice for shopping. It is often eaten with pancakes, waffles, French toast, or oatmeal and porridge. It is also used as an ingredient in baking, and as a sweetener or flavouring agent.
Sports lovers do not miss hockey memento, there are so many choose from NHL teams such as Montreal Canadiens, Toronto Maple Leafs. In addition, outdoors enthusiasts will find a vast selection of stores selling all the must-have gear and clothing.
Many large US retail chains such as Walmart, Costco, Target, and Best Buy are also found in Canada, and the country's shopping malls feature dozens of US boutiques. Sears is the only major US department store that has a major Canadian presence.
Here's a suggestion:
In certain establishments such as flea markets, antique stores, farmer's markets, etc, you may be able to negotiate a lower price.