From my perspective (being Canadian, and having enough money to purchase milk) the price is fine with me. No one in my family drinks milk. My kids have it with cereal, and I use it for cooking. A price of $5 CDN for 4L of regular milk, and $9 CDN for 4L of organic milk is just high enough to ensure that it is drunk in moderation. Using Walmart, I chose Plano, TX and the price of 1 gallon of Walmart brand milk costs $2.41 USD which converts to $3.05 CDN so Canadians pay a $2 premium. I purchase 4L every 2 weeks, so I pay $48 more per year to have a milk system that benefits the farmers, and their neighbours. I'm OK with that. Plus that extra $2 ensures that Canadian milk doesn't contain growth hormones which are permitted in the USA.[1]
It amounts to about a $150 dollar a year tax (more with the more children you have). Only, the tax goes to 13,000 producers, so it's a regressive tax that penalizes the poor.
[1] https://bcdairy.ca/milk/articles/does-milk-contain-growth-ho...