Shipstation has bestbuy.com but no bestbuy.ca integration. Can this be a quick implentation since your USA bestbuy.com store should not differ much to bestbuy.ca platform.
Update:
ShipStation has an integration with Best Buy CA that allows you to import orders from the Best Buy CA platform and update those orders with tracking information when a label is created.
Learn more about it here: https://help.shipstation.ca/hc/en-ca/articles/360039400812-Best-Buy-CA