Aeroplan is starting Boxing Day promotions early. From now until January 2, 2018, members can earn up to 7x the miles on select retailers (including: Michael Kors, Indigo, Under Armour, iTunes, Sephora, Nike) at the Aeroplan eStore. Costco.ca has its own 4x miles promotion between December 18, 2017 to December 28, 2017.
This may not be as good as the 10x promotion that we saw earlier in the year, but still good. Shopping portals are always an amazing way to earn more bonus miles for purchases that you were planning to make anyway.
Always double check the prices that you are about to pay. I would not buy items just for the sake of earning bonus miles. You still want to buy items within the target price that you had in mind. Here is a hyperlink to my most recent shopping tips. I will be updating those tips towards the end of the year again!