Boesner is a chain and sells its own products, which are often a bit cheaper than the ones of traditional companies like Hahnemuehle etc.
One thing that was completely new to me is that paper can also be made of stone. It has a very smooth surface, perfect for ink drawings.
I also tried it with watercolour and lots of water and was able to create quite interesting effects.
A great asset is that the paper remains completely FLAT, no matter how much water you use with it.
So give it a try! Boesner Steinpapier