Lots of WWII era bolt actions are still kicking around Central/South America for reserves/militias etc. The Venezuelan red-shirts (oh, if only they were smart enough to watch Star Trek, they might have chosen a different fashion statement) are largely armed with mossy-nuggets. Mausers are also quite common with militias in that part of the world.
The problem with old guns in that part of the world, is that the hot, humid climate, combined with the negligible training and education levels of the militias, means that these guns are quickly rotting back into the soil. But you never know. There are some armouries with caretakers who somewhat know what they're doing, so a few batches of old guns might emerge in usable condition.
The only other real chance for significant numbers of older milsurps is North Africa. Untold thousands (millions?) of "anything that goes bang" have been bought up by the various petro-states and desert warlords since the end of WWII and thrown into warehouses or buried in a random chunk of sandy nowhere, "just in case". It never ceases to amaze me what kinds of antiquated gear ends up being photographed in use whenever they decide to exercise North African Lead Democracy (TM and Patent Pending).
The problem with vintage guns making their way from those regions to Canada, legally is... Well... International law. The less civilized parts of the Americas, and most of North Africa, are perpetually under various forms of sanctions and watches. This doesn't stop a steady flow of guns getting into those countries (because they couldn't give a flying fig about laws and sanctions), but it does do a very good job of making sure that those guns never make it back into the civilised world.
But you never know. Hope springs eternal. If a sudden rash of democracy and rule of law and good governance breaks out in those countries, they may sell off old stockpiles to balance a few books. Stranger things have happened.