Magazines Canada has created a Tariff Resources Page with Live Updates!
They also published their survey results of the potential impact of proposed US tariffs on the Canadian magazine industry:
Anticipated Impact of US Tariffs on the Canadian Magazine Industry Survey Report from Magazines Canada
British Columbia’s tariff response measures can be found here:

Updated March 6, 2025
“Premier David Eby has announced new tariff-response measures with the intention of bringing forward legislation that will defend British Columbians, workers and businesses from U.S. President Donald J. Trump’s tariffs on Canadian goods and energy.”