They are bound to turn up on the german ebay but might not be easy understanding what the feck it is all about. There are some people on Ebay who obviously source wheels from Germany but you do have to pay a hefty premium for their wheels.
So the moral is learn German....Seriously, if you find the wheels on the german site just as k question in english because they will probably understand at least some english and take it from there.
There are lots of places on the web ...including this site where you can find out which wheels fit your car eg size, offset,pcd etc..it is best to establish this first before you search
Hope this helps
Alan