I live in Canada. For years, I've hauled your orders across the border and mailed them with the US Post Office. Lately, I've become uncomfortable with the political climate in the US.
Crossing the border is not as easy as it used to be; the guards ask a lot more questions, and when they ask "Are you leaving anything in the US?" and I answer "Yes, I'm shipping some old railroad timetables to a guy in ____", well ...
Some (especially the younger ones) have a problem with the concept of collecting stuff and its financial value. And they may not consider the concept of "friendship". If I'm selling the goods to you, that's commercial

For a while, mailing from Canada was the answer. Put a customs form on the package and ship it off. But now there's another problem.

In 2025, while waving tariffs around willy-nilly, Donald Trump eliminated "de minimis". "De minimis" is a Latin phrase referring to issues or amounts too insignificant for authorities to care about.

Shipments valued at $US 800 or less formerly entered the US quickly, without Custome procedures.
Now, however, all commercial shipments into the US, nevermind their value, are subject to duties and full customs clearance procedures, and require payment IN ADVANCE of all applicable duties and tariffs.
I have to upload a picture of the items you want to some third-party Canada Post has conracted with. This third party decides what the duty, taxes and fees are and gives me a QR code. I take your package and the QR code to the post office and pay, and your package moves.
That's clearly not going to work - I'd have to ask you to pay for everything in advance - goods, postage, dury, taxes and fees all up front.
The bottom line is, this is all bullshit requiring too much time, trouble and effort on both our parts.

So - I regret that I no longer sell to addresses in the United States.

If you have a problem with this, you know which political party is responsible. Vote accordingly in the future.