Hello,
What do you mean when you assume they are "copies"? I should hope that there isn't a dealer selling fake notgeld out there....
In any case, collecting German and Austrian Notgeld issues from roughly 1914 to 1924 is an entire field of its own. Here's a site you might want to get familiar with:
https://notgeld.com/
By the way, your 200,000 Mark note is not a notgeld issue, but rather a regular German note of the time (which can be differentiated from Notgeld by the word "Reichsbanknote").