I've had many requests. but I am not doing any comissions for the gas mask. Not until I can find a local supplier for the voice changer and figure out a way to make the head cowl adjustable. Both of those things would increase the price quite a bit.
I know of the top of my head to by the mask and voice changer locally is already 60-65 bucks. Headphones/sunglasses put me back another 30 bucks and the materials for the cowl can range in the 30-50 dollar range. Depends what I make it out of. (currently considering sheet metal)
Do you really want to spend 150+ labour on a gas mask?
edit: forgot the cost of rewiring the voice box to accept 3.5mm mini jack
edit 2: thinking of all this interest I wonder how much the thing will fetch on ebay. The reserve would at least be the cost of materials so I could either make another one or
pay for my four disfigured and damaged wisdom teeth to be removed.