This article was a fun read, and it really highlights how we trust the words on the tin to be accurate and not mistaken marketing gibberish.
However, the part about the cost ranging from $40 - $80 is simply not true. I know this, because I purchased for $20 yesterday a faraday box to hold my auto key fobs and my cell phone. [1] There are very many items for sale at this price point, fabric, pouches and boxes.