i am from germany, in germany … no shop does have the dw1640 black retail
where can i buy the dw1640 black retail

JES computer sell the 1640 black bulk version but it’s not in stock at the moment and also sell the Plextor 740A black which is a re-badged 1640 that you can easily crossflash to the retail 1640 firmware.

As for black retail version of the 1640 in Germany not sure maybe someone else knows.