GNC cannot accept non-US billing addresses, even though the order is being SHIPPED to the U.S. After explaining the situation to their Customer Service rep, I was rudely told they don't want my internet business, and just shop in Canadian GNC stores (many products are NOT available there!). It is obvious that GNC is willing to ignore 10% of the North American market when they are unable (or unwilling) to accept non-US billing addresses (even though I can walk into any US GNC store and use my Canadian Credit Card!). Canadians - don't even bother to order from them!