Being in Canada, I won't buy from any US seller who uses UPS to ship here. The seller cannot know, but the shipping charge that he adds on to the selling price is nothing compared to the "brokerage charge" that UPS hits the Canadian buyer with. It is not unusual for UPS to charge +$50 on a $20 item. The seller does not know this, and the Canadian buyer does not, either, until the UPS guy is at the door with a bill for the brokerage charge. Refusal to pay means the item is not delivered. If the goods come USPS, the charge is $10 max.