Don't know anything about Tropisch....but....
I've met a couple of Von Den Oher Tannen dogs in person, they were in pet homes. Owners were happy.
You may want to PM Neko, she's a member here and has two Oher Tannen dogs.
If your willing to travel a bit further into GA there's also kennels von Lotta. German Shepherd puppies for sale | German Shepherd breeders | Imported German Shepherd Puppies| German Shepherd Kennels
Both breeders are active in sport and conformation venues.