Stopped by my local Houston Best Buy today and found the Fan Channel Exclusive The Black Series 6-Inch 40th Anniversary Carbonized Stormtrooper on the shelf. The employee said he just stocked the shelf with them today. They received 6.
If you preordered this figure back in May from various retailers i.e. Entertainment Earth, Hasbro Pulse, and etc, you preorders should ship out any day now.
Above is a quick photo of the box. Just a note, the boxes are a shiny chrome and were scuffed up a bit.