For those interested ...
Rails
Offered 10 USD / Set for 8 Sets, got an Invoice and after contacting the Seller, he adjusted Shipping to approx. 23 USD (to Jetcarrier US).
This one probably calls for Sea Shipping since it's 2kg / Piece so 16kg in total for me ...
List Price is 18 USD / Set (already discounted from 24 USD / Set) so I'd say it's quite good
Only 3 Left. I was pretty sure the Seller had another offer which he took down that had more than 11 Pieces. Might be worth to contact him and ask if you are interested in more

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Riser
I just found this Riser which was added Recently:
TYAN M8036-
L16-1F - 75 USD for 5 Pieces (15 USD / Piece) - 7 Sets currently remaining
So 15 USD / Piece plus another I guess ~ 40 EUR for a Package of 2 Sets (10 Risers) to be shipped to Denmark via Jetcarrier, so probably around 20 EUR / Piece overall.
Not a super good Deal compared to the entire Server but considering that Supermicro standard x16 Risers go for about 10-15 USD/EUR it's not too bad either considering these are/might be a bit special. Indeed the PCIe Slot Alignment is different compared to Supermicro PCIe Risers so the Supermicro Risers would likely NOT work in this HYVE Edge Chassis without some Modification.
I just ordered 2 Sets, so I will have 2 extras here in Europe if somebody else is Interested

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The only other "Deal" I found so far on eBay was from China at 30 USD / Piece (DOUBLE !!) of the TYAN M8036-
R16-1F one.
EDIT 1: added remaining Quantity for Rails (3 Pieces) and Risers (7 Pieces)