Reply to Smoke gun ?

Been doing a lot of parties and events lately , and the crowds have been loving the smoke machines !
That feeling where you just bury people in smoke on a drop is one of my favourite parts of DJing , but I had a question

Where on earth can you buy a smoke gun ? I've seen so many DJ's use them live ! They look so INTENSE !

Heres a kind of sample of what I mean



Any idea where you can get something like this ? Give me some links!