Dithmarscher is SO awesome! I left that out because I don't know where to get ít in cans! You're my man!
Nowhere.
I went "Zu den Frauen" near Heide, a supermarket, but only in bottles. No big deal as I was alone anyways, so I took 4 of them. All different ones. Still have the 4 bottles. (in my old home though, but that's a question of moving them here)
And last year during Hörnerfest, someone bought me a crate (24) so I drank it all the time (except on the field of course)
And no matter what'll happen, I'll have my portion this year!

Even if that means, going to somewhere in the north, just for the beer.