Prime Minister Justin Trudeau has imposed unjustified retaliatory tariffs on the United States on many imported products into Canada. As a result, a 10% playing cards tariff came into effect on July 1st, 2018. This puts Canadian Pokémon TCG players at a competitive disadvantage with the increased price on the already unnecessarily expensive imported TCG cards for upcoming sets such as: Sun & Moon Celestial Storm and Dragon Majesty. Most retailers in Canada are now currently selling a Pokémon TCG 10 card booster pack for over $6CND including tax.

"The tariff on playing cards — which came into force July 1 — applies a 10 per cent charge on a standard deck of cards, but trading cards like Magic the Gathering, Pokemon and Yu-Gi-Oh cards are also hit. (CBC News)"

"The United States Playing Card Co. reacted to Canada’s tariffs by asking “Is that the best you can do?” — since Canadian sales were only a small share of its overall demand. (Financial Post)"

Sources: https://www.cbc.ca/news/canada/ottawa/playing-cards-tariffs-ottawa-1.4746544 and https://business.financialpost.com/opinion/jack-mintz-canada-has-already-picked-a-losing-strategy-for-trumps-trade-war

Update - May 20th, 2019: Finance Minister Bill Morneau says Canadian tariffs on U.S. bourbon, playing cards and licorice have officially been lifted.

Source: https://globalnews.ca/news/5295129/canadian-tariffs-us-products-lifted