Everyone I know who's gotten it has gotten it direct from BrewDog. I know they sell it on their website, but not sure if the guys who I know bought it or got the hookup from BrewDog. But you might try their website?
There is only 400 or so bottles coming to the US with that split up between NYC and California. I don't think they have made it here yet because of some labeling issues with the beer actually being classified as a liquor in the US and that's a whole other set of hoops to jump through. When they do I'm assuming they will go pretty fast even at $60/ bottle or so.
On the website I believe it's going for 35 pounds plus shipping. Who knows what that is to germany, but it's gotta be less than to the US. I should get some while I'm over here perhaps. To make no mention of sink the bismarck