Mercifully, I'm not talking about some bzarre pre-order DLC, which is available only at GameStop and bestows hero Connor with a foam weapon with which to annoy his enemies. I'm talking about a foam tomahawk you can buy, then run around pretending you're a deadly member of an ancient order of assassins.
It's officially licensed by Ubisoft, is 50cm long and is available from Jinx. For something made out of a soft, gentle material it sure looks dangerous, so apply caution if using in public.
Assassins Creed 3 Foam Tomahawk [Jinx, via OTL Gaming]