They are not extremely rare but also not very easy to find. And about 2 months ago there was an article in a german knife magazin about these knives. After that 2 of the knives were in german ebay and the prices were higher than before (about 60 EUR). Usually they do not show up very often. It`s definitely a nice collector piece because it is an official police knife and because it`s different from the standard Rucksack model.