An Amazon UK "exclusive collectors edition" has now appeared
Subsim UK Amazon Store: Type
Silent Hunter 4 in the search box
Update...
Although the contents are not listed on the UK Amazon site, don't take it as read, but it's probably safe to assume they are the same as the German Amazon exclusive edition. Compared to the super duper Ubisoft Limited Edition version ...
You get
CD soundtrack
Collectors Edition patch (sew on badge)
96 page recognition manual (may not be spiral bound & is 20 pages shorter than Limited Edition version)
Special box
You lose
The dvd, the pen, the certificate, the metal tin, the medal, the notebook, the art cards
Outside Europe?
Unfortunately for those in the US/Can it looks like Amazon will only sell this within Europe.
Inside UK/Europe?
If you are within the UK/europe this is your best alternative to the Ubisoft offering as everyone else is selling the basic vanilla edition at the same price.
Support Subsim!
If you decide to go for it, you can support Subsim & purchase it through the Amazon UK link in the Subsim store.