Where can I buy raw cacao nibs? In Berlin, Brandenburg, or by mail order?

Rossmann currently doesn't have any cocoa nibs from its own brand Enerbio. Alnatura cocoa nibs cost €5.99 for 150g, which is expensive for me, as I probably use two to three packs a month in muesli or porridge. Where can I buy raw cocoa cheaper? At Reformhaus, 100 grams cost €5, but it's even more…