I second Richards post. We destroyed pretty much all of the former GDR weapons after the reunification in 1989/1990. Only very few made it into (Police, Military and Government) collections and museums.
According to our "Kriegswaffenkontrolgesetz" a private party can not own actual or former military weapons, full auto is highly illegal anyway. There are only a few exceptions, I could turn my H&K SL-8 into a semi-automatic G36 without a problem.
I wish I could have gotten my hands on one of them Markarovs or Tokarevs...
Former East Germany did export alot of arms to Africa and Latin America. There should be quite a few of those "old irons" around.