You can do the distance learning course in english with
intercockpit. They are using the bristol groundschool material.
Another ground school is
groeger. But, so far I know, they offer only a distance learning course in german language.
Price for the course : 2.600,-- ( without the required brush up course )
Just for your information; in Germany itīs
not possible to split the examination in 2 or 3 modules ;-(