I like to buy local and support Canadian, I searched a couple years ago go 41 brass. I called every gun store in BC, Yukon, Alberta and Saskatchewan. Luckily I found a lot in Sask so I quit looking.
The thing with niche items like this is that they are tough to find, and in a lot of cases very expensive compared to south of the border.
If you wanted to buy enough to last you the rest of your life it would be worth the import fee (if it’s still allowed to be imported) as it would be a lot cheaper.
I live in a small town, I’ve been looking for 44 special (2 stores near me and 1 an hour away) they want $82 for a box of 20. I’ll be buying it from another store in Canada and when I do it will be a lot too make it worth the shipping. Same principal. I support local when I can, when they have what I need and when the cost is reasonable, I’ll pay more but not go bankrupt over it.