Oh we have them in Australia (Melbourne) i enjoy eating the ones at the Asian grocers as they put some type of spices on it and sprinkled chilli flakes on the top. Costco sells them to and they aren't that bad either
Define "very common". Here in Slovakia you can probably get it in convenience stores if you really want to. But no, it isn't a common snack. It is more of an overpriced western "treat" you buy when you maybe want to try it out.
Potato chips and candy bars like Twix/Snickers is probably the most common kind of snack people would have here.
I see it here on the shelves in Australia, especially as a snack food in petrol stations. It is usually the South African version, called biltong, which is spiced and much more interesting than US style jerky.