Ok i got mine
http://www.medgestore.com/products/kindledx-go.psp after 10 days of delivery.
Its awsome for my needs. Its not that protective as it could be if it would have metal plates attached or something like that but its enough for taking ith with you and still "taking care" - if you know what i mean.
The point is it is very light and small. The Kindle DX is still good to handle and with the cover flipped to the back it is much better to read then without a sleeve in my opinion.
Most important for me is the quality. Its a very fine genuine leather with premium stiches. Last but not least i was looking for a sleeve which doesn't use the kindle lock system cause i have read much negative issues about broken frames which sound logical to me cause the DX is much heavier then the K2 and it is obviously that is is not good for the DX to throw by his own weight to a small metal clip.