Well, I don't know if Mr. Bungle is planning to do a run of them, but you can get the official helmet here:
1:1 Judge Dredd Helmet Replica - Planet Replicas
The helmet on my Dredd costume is one of the Planet Replicas prototypes and it's excellent.
Well, my goal next year is to make it to Dragoncon. (Though I say that every year).
One of these days we shall dispense justice together.