I can’t speak to accuracy, but did you look at realmilk.com? They have a button on the home page for international, and Canada is one of the choices.

I agree that people may not want to say their source out in the open- but for what it’s worth, where I live, it’s “illegal” to sell it in a store, but we can legally have a Private Member Association where consenting adults can buy and sell to each other. Might be something to look into. I started with buying beef directly from a local rancher and asked him where he got dairy from, and went from there.