First things first, this perfectly made Dishonored mask is not for sale. If you want to dress up like Corvo, go get some aluminum foil and get to work.
This gorgeous replica was built by the team at Technically Magic Effects for a contest that we didn't win. Which makes its existence all the more unfair. Arkane studios shared the actual 3D models used for the mask in the game. Which means that this is no different from Corvo's actual mask. We want.