Er, no.
However if the item was bought outside of a country which shares a 'common trade agreement' with your own country (which in your case means 'outside NAFTA'), you'll probably have to pay local taxes and duties when you import it.
Most countries allow travellers to bring back low-value gifts and souvenirs without paying such taxes. In the UK the limit is currently goods to the value of £135 (= US$212). Thereafter you'll be charged Import Tax and Value Added Tax.
(See my post for Philtaz, on your other thread, for information about the complex calculations which are involved).
Chris



