Most of the Road Champs vehicles are released in "blister packs". These are cards with the vehicle encased in a clear plastic bubble. It looks like a blister on the cardboard. (For those of you who have ever had a blister on your hand or foot).
The boxed version is less common except for the surburbans and truck issues.
Canadian packages are a little different from what we see in the States. I have only seen one Canadian packaged car.