Updated on Aug 29, 2020: Just FYI, you can purchase Sobeys/Safeway gift cards (or other gift cards) in Staples stores with "Happy to Say Thanks" cards. I have done it successfully this afternoon. YMMV.
You can receive 7500 PC Optimum points (value $7.5) when you spend $50 on "Happy Student" or "Happy to Say Thanks" gift card in Shoppers Drug Mart between Aug 29 to Aug 30, 2020. This is equal to ~15% return. BTW, Aug 29/Aug 30 are the Super Sales Day in SDM with many good offers in store.