On November 3 and 4th spend $50 at Shoppers drug mart and receive a free $10 Petro Canada gift card.  Gift cards must be used between November 4 2007 and November 30, 2007. 

Here are the other restrictions listed in the email I received: Offer valid on the purchase total of eligible products after discounts and redemption’s and before taxes. Excludes prescriptions, products with codeine, tobacco products (where applicable), stamps, lottery tickets, event tickets, transit tickets and passes, electronic gift cards, Life Experiences packages and prepaid phone cards. Due to location restrictions we reserve the right to substitute an item of equivalent value.