A lot of it is taxes and duties @gravling in order to discourage cross-border shopping. A lot of companies charge higher shipping between the US and Canada to cover any fees that might spring up. The truth is it's better to actually cross the border and buy something and bring it back instead of having it shipped because if you get a border guard who doesn't care you can skip out of paying duties.

...and so goes NAFTA! Seems Mexico got the best of that deal after all. Not hatin' just the facts Ma'am 🤔