There's no branch of dunkin donuts in this area (boring!) nor a chain specializing on donuts. I only buy them at the bakery or grocery shops. I have very limited choices too, sugar-raised, chocolate coated, sometimes, one that is filled with cream, but not boston cream like Dunkin Donuts. The more popular krapfen would have vanilla or jam filling (apricot, peach, blueberry).
There is one bakeshop where I buy this chocolate-dunked donuts, Nöbauer Konditorei...it is a 15 minute bus-ride from home so whenever I get the chance to visit I buy a dozen...coz the kids love this with its softness and not so sweet coating.