For sale on the Internet, but...
...currently sold out.
Listed as a "cool case" for the encouragement of the terminally stupid.
I just wondered where on earth you would get such a thing in the UK. Shipped from Hong Kong apparently.
Still, if you can buy realistic looking plastic guns for "dressing up" from eBay I suppose there is nothing illegal about it. Although you would have to be an even bigger idiot (assuming that is possible) to try and take a plastic gun on a plane.