Durametric on eBay
 

I was browsing through ebay and came across this:

OBD Diagnose Service Rücksteller FÜR Porsche 911 997 996 993 987 986 Cayenne | eBay

I did the translation and took a chance. Won a similar listing for 67 euro including the shipping. Item has shipped DHL. It was a low risk purchase, could work out well. No case, just the cable and software.

It looks a lot like the $19.95 Chineese Durametric knock-offs and since it mentions "Durametic Service" but is not specifically an authentic Durametric product I would assume that its a Knock-off and not pay more than $25 including shipping for it.

There is no reason a used authentic Durametric with one VIN left, would not sell for $100 so if its a lot cheaper than that its probably a knockoff.

most likely the case

I'll let you know and post some videos when it arrives.

Interesting that the seller has a listing that does appear to be genuine (EUR 399):
Durametric Diagnose Kit FÜR Porsche 997 996 993 991 987 986 Cayenne | eBay
Note that in the item specifics it has the brand as Durametric:
http://986forum.com/forums/uploads01...1456762570.jpg

The item they have multiple listings for does not have a brand:
OBD Diagnose Service Rücksteller FÜR Porsche 911 997 996 993 987 986 Cayenne | eBay
http://986forum.com/forums/uploads01...1456762682.jpg

If it is as described, it should at least be functional for your needs. All of the cheap Chinese cables that I have seen listed before were only functional on Windows XP. This at least looks like an updated knock-off.