Surplus ammo in Canada is fine, I think. Be mindful of "ammo shortage" articles coming from the US, where the rules are way different. Most surplus 7.62x39, and more recently, 5.45x39, is banned from import to the US because of the steel core issue, which BATF considers "armor penetrating pistol ammo" because, well, Americans will make pistols that shoot anything. (And yes, there are AK-47 pistols and AK-74 pistols around).
The 5.45x39 ban is fairly new down there, really just rumours of importers getting denied import permits and supply drying up. Good news for us, because Canada is the next best/most profitable dumping ground for east block surplus. Now we just need a cheap surplus rifle that isn't prohib chambered in 5.45x39