I remember making 'fireworks', using potassium nitrate, charcoal and sulphur, back in the '70s. Those were the days, when you could make small and simple explosive devices and nobody minded provided you didn't cause damage or inconvenience. Those were also the days when pure and unadulterated sodium chlorate could be bought by the pound at a garden supplies shop.
I don't remember being able to buy detonator cord or anti-personnel mines though. Maybe I wasn't old enough.