those of you, who don't live in an English speaking country will know, that stamps in the local language are sometimes hard to get by. So I used the opportunity during C&S 3 to ask the others if they knew any other companies that sell good German sentiments. And they had quite a few tips for me, that I hadn't known before.
So I enhanced my list with Germany online shops a little. All the shops in the list sell German sentiments.
If you have any further links that are still missing, I'll be happy to add them.