USPS Priority Mail Express® cheapest shipping from canada to usa USPS Priority Mail Express Open & Distribute® Service international shipping rates from canada canada to uk shipping USPS Prepaid Forever Priority Mail Flat Rate canada wide shipping costs cheapest postage service USPS First-Class Mail® cubic rates ship with shopify https://opensocialfactory.com/story15276232/asendia-shipping-to-canada-no-further-a-mystery