After some search, I came across this offer, which was the best (have price comparisons / Ebay and Amazon durchgeschaut) and I must say I was pleasantly surprised.
Fast delivery, knotless packaging - sealed cardboard itself and should something a little moisture come through the paper again packed in a water-repellent shell - plus stable enough, these are pressed not 1-2 packages, so that you would have to throw away tens of pages.
So far (2 Packages already consumed) I can not complain about the paper itself also, it is well drafted and the printouts are used well.
For me, a strong buy recommendation.