Costco: Earn 4 Aeroplan for every dollar spent

Expiry: Feb 3, 2019

You can earn 4 Aeroplan Miles for $1 spent on Costco.ca from Jan 21 to Feb 3, 2019 when you enter promo code "AERO4" on the checkout page. From my point of view, this is equal to ~6% cash back.