I got one on Etsy from a seller called "ShiningParty". Took about 6 weeks to arrive.
This thing is 100% definitely unlicensed, but still very cool. Fits my large (24") head, with the face plate only sometimes lightly touching my nose when it closes (but not hard enough to be unpleasant). English voice commands are very responsive, even picks up whispers. I can see out of the unlit eyes just fine. When lit, I can see a little bit out of the left eye but not enough to walk around confidently. The paint job and the sound effects re very convincing. I made a short demo video and sent it to some friends, and 100% of them assumed it was a metal helmet.