Rauchkörper mit Kipphebel
http://egun.de/market/item.php?id=2358016
3 for €55 (with the ignition system included)
The orange ones are supposed to work the best, the other colours are not as good (except white, but they don't sell it here)
There are some other sites that sell them, but I can't find other sites with the ignition parts (the kipphebel.. don't know how to say it in english, but actually the whole "head" with the "lift" on it)
They are called "Rauchkörper" and are made by "Piepenbrock" (German Pyrotechnik company)
They work the same as "real" smoke grenades.. pull the pin, let the "lift" jump off (the Dutch ones don't shoot of but stay attached) and throw the grenade.. Then it has a 2,5sec delay, fires and starts smoking..

Sure, someone may one day kill me with my own gun.
But they'll have to beat me to death with it because it's empty.
A computer once beat me at chess, but it was no match for me at kick boxing.