Hi Kees,

even though these are known vendors in germany, they donīt carry the spyderco hones.
If you are looking for other options I have bought a lot from these germans: feinewerkezuege.de, dick.biz and rasurpur.de

Very friendly, very nice stones at quite competitive prices (compared to others in Eu, I guess)
You should have a look at the Naniwas from feinewerkzeuge.
The Superstone 8k is simply one of the best polishing stones that exist.