You can earn 3 Aeroplan miles for each dollar spent on costco.ca between Sep 9 to Sep 22, 2019. Please use the promo code "AERO3" at checkout.
BTW, if you are not a Costco member now, you can earn up to $40 bonus when you register a new membership before Nov 24, 2019: https://www.canadianrewards.net/2019/09/costco-new-membership-promotion.html
