Great savings at your local Costco warehouse location in Canada. Costco Canada has released today, December 26, 2018, the new Boxing Week 2018 instant discount handouts! These handouts are available at all Costco Wholesale warehouses in Quebec. Only Costco Canada members may use these instant savings handouts. These new Costco Canada instant savings handouts for Quebec. Most of the items are valid until January 6, 2019. But some items are valid for 3 days only until December 28, 2018, some are valid until January 3, 2018, and few items are valid until January 7, 2018.