ya I usem, lovem, my friend sent me a few pairs from Switzerland from an army surplus store, he paid 5 swiss francs each. Came in the original tin about the size of a small egg. THey are not elastic band but just a simple string that you tie aroudn your head. THe only thing about them is the metal, so during electrical storms I have had them buzz on my head..little weird, but its all I use, no fog problem as the metal casing is perferated and the edges are coated in felt for comfort.
Maybe try an army surplus store obviously the mountain division type stuff.
Cheers