It seems if it's within 30 days of purchase you can do it. Here's the link for Sportchek's price matching policy.
https://www.sportchek.ca/help-desk/orde ... ching.html
"At Sport Chek we constantly strive to offer competitive prices in the market. If you find an item available for sale at a lower advertised price prior to purchase; or within 30 days, we will gladly match that price of our competitors. Prices in-store may not reflect the price at which we offer items for sale online."