Should I say that I'm from Austria?
Just had a look at the sources you posted and I don't think they are trustworthy (that doesn't mean that the story with the 600k in Krugs could not be right anyways...)
Whenever I buy on eBay I contact the seller in advance and ask for a better price if we deal without eBay and PayPal. Usually no problem (with dealers I know).
Buying here I use Transferwise or Revolut. Cheaper and 'better' than PP.
The UK should team up with the USA and show the other EU members how it could work. So we might get rid of the EU in it's current form...
Ordering from US dealers without/with low import duties would open new possibilities