Tariff for used item from Canada to US

If I interpret your post correctly here’s my take :
The dealer told you on the front end that you had the tariff risk . Despite that you made the purchase and accepted that risk without doing some research beforehand on what the estimated tariff might be. So yes, I think it is fair that they don’t take it back you made the purchase knowing there was the risk,  the fact that you didn’t look into the risk before agreeing to the purchase isn’t their fault.

I am at a loss to understand this.  I am in the US.  For many years I have been buying electronic (and other) merchandise from foreign countries. Among these 2 cartridges, a DAC, connectors.  They have come mostly from Asia, but also from Canada and Europe.  About 5 months ago I bought a renderer/digital bridge from a private party in Canada listed on the Canadian Audiomart.  Today I received electric cable from Hong Kong. 

I have never had to pay a tariff.  Never.

I have sold to Canadian buyers and it has always been my understanding that Canadians have to pay tax, and brokerage fees unless they make arrangements, which are unavoidable.

Thanks for your opinions. Others be careful buying from foreign countries  in the future.
Cheers