The manufacturer claims it's a "special" rum (from their FAQ), so it's unlikely you'll find it in the wild. You could try contacting them directly to see if they sell it under license elsewhere.
What makes Casali Rum-Kokos unique?
The unique taste of this Caribbean classic is the result of an exotic mixture of components - of chocolate, coconut and rum. The various textures in combination with the different flavours make for a delicious explosion of taste in your mouth. Thanks to special Casali Rum, it is only Casali Rum-Kokos which have the original taste - often copied, never achieved! Needless to say there is no question of the use of artificial colourings and preservatives in production of Casali Rum-Kokos.