I've never seen canned coffee in Poland, Czech Republic, Greece or England, but I can't speak for other countries.
Canned and cartoned(!) coffee is all over the place now in the UK. Starbucks make a lot of it, and there seems to be quite a few smaller brands popping up.
It's all full of sugar though, more like slightly coffee flavoured milkshakes. Combination of the sugar and caffeine really works though...