Ok, if you want to hear ridiculous regarding sending goods over the border:
I had a tegra computer board from my Tesla, built in Fremont California, that was failing because of a $20 flash chip. My choice from Tesla was replace the whole MCU infotainment unit (the whole big glass screen and all the guts contained) at a cost of $4000 Canadian at a Canadian Tesla service centre. Some figured out a way to simply replace the chip in the tegra board by hot air soldering a new one, and transferring the vehicle data from the old chip to the new one, so the car worked. After many success stories from others I decided this to do this.
I removed the MCU unit, removed the tegra board, and mailed it down to a fellow (with an Asian name) in California to do the work for $500, then I would get it mailed back and reinstall and I save more than $3000. Great!
He suggested I insure the tegra board for $2000, because that would be the cost to replace it should it get lost. Makes sense to me.
I ship it insured for $2000 via Fedex from Canada to California, and Fedex charges the receiver $300 extra as the tegra board was made in China, as this was when Trump was in office the last time and he slapped a 15% tariff on all Chinese goods.
Yes, a part from an American car, sent from Canada back to the US, was subject to a 15% duty on a "suggested" $2000 replacement value for a $100 actual part cost, to replace/repair a $20 part, because the computer board was made in China.