It would be nice to have a "Shopping Cart" set up feature (check box) in ShopSite Manager/Pro that would indicate:
"A Shopping Cart which displays/offers a "SHIPPING" Rate Option (even if $0) must have a U.S. Zip Code."
This would allow products that have NO SHIPPING CHARGES to be sold Internationally while those orders which HAVE computed shipping charges (even if the displayed "Shipping" is $0), to be limited to U.S. Zip Codes.