mailing/shipping to canada

Man Canada has some strange charges 3-5 bucks per package? Truck fees? Taxes on used parts? I guess they have to fund the Socialized Health care some how?
There is not supposed to be tax on used auto parts. But at some point i dont want to argue , pay and get on with my day. Its an expensive hobby,but 1/2 the time its cheaper even with shipping to buy south of the border.