@Big_Mak mentioned over in CNC End Mills - vendors and recommendations about ordering from McMaster-Carr, which until recently has had a policy of cancelling any orders from Canada from new accounts (i.e. they’d only ship to accounts that existed before that policy was put in place). I figured I’d try my luck, placed an order yesterday mid-afternoon, and sure enough I have a package from them today - next day delivery, as fast as DigiKey!
This is pretty huge news for many of us I expect, as McMaster-Carr carry a lot of items (screws, mechanical parts, tooling, etc) that are very hard to obtain from anywhere else, and at reasonable prices. I see even more robots, 3D printers, and animatrons in our future! 
My order only had a handful of small end mills, with a stated weight of 1lb and approximate dimensions of 25x16x8cm (the stamp on the box states the internal dimensions are 9"x6"x3"), and shipping came to $18.42 (the order was $95.62 + $5.70 GST; no tariffs/customs/etc was charged).
Do note however that this was ordered under my company name, so personal orders may be treated differently.