Tariff for used item from Canada to US


I bought a used Auralic streamer from Canadian Audiomart, got a UPS email holding the item and demanding $450 tariff. I emailed the seller, an audio shop in Canada if I could have it returned, and they said no. I paid through PayPal. The shop did mentioned it MIGHT got tariffed since its a Chinese made item. Is it fare that they refuse to take back? What would you do if you re in my shoes? The $450 tariff will make it as expensive as new in US.
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