Herzlich willkommen, Peter!
I don't have any leads, but planes do get listed here from time to time, so keep watching.
I have bought a 150, a 172 and a 182, and I found all through various forums when they were first listed. If you have time and patience, you can find very nice planes at a good price. The good ones typically don't stay in the market more than a couple of days and often don't ever make it to the trade publications.
Where do you fly in Germany? I am often in Karlsruhe and sometimes fly out of a glider field in Landau. it is very beautiful there.
