If you buy something at costco.ca, you can price match if the prices goes lower within 30 days
Price Match - Costco.ca Orders - New!

Costco.ca will gladly issue a credit for the difference between the price paid and the current lower price if your purchase was made online at Costco.ca and placed within 30 days prior to the change in the price of the item. Please use the form below, to submit your request.

Please note:

The special consideration for promotional pricing is for end consumers only. Resellers must purchase the item during the valid promotional dates to receive the promotional price.
If you purchased the item at a Costco warehouse location, please inquire at the membership counter at the Costco location where you made the purchase.
Costco.ca does not price match items purchased at Costco warehouse locations or other retailers.
disclosure:
https://customerservice.costco.ca/app/promopricematch
form: https://customerservice.costco.ca/app/promopricematch

You do not have to have a Costco membership to shop at Costco.ca

YMMV