The 'outstanding' will be translated into lamans terms as 'duty'. You can expect it. See the 'duty' we pay is our government collecting GST on items we have not paid GST for. If it did not originate in Canada the reciept of sale attached to the package will be used to determine this.
Any item that this applies to will need cash at the door on delivery or go to the holding sight, postal outlet or fedex building.