Microsoft actually shelled out a couple million dollars in putting that together as a TV advertisement. Indigo.com had displayed that in a video and those cases where custom made just for that advertisement. The object was to sell the tablet.
In order to get those actually on the market, you need to get your company to contact Microsoft's corporate headquarters to display an interest and get other companies to do the same. A manufacturer will not tool up to manufacture unless they have an order
big enough to do it.
Those cases you saw where custom made by Microsoft themselves along with the "all weather" docking station case. Those where probably the most expensive cases ever built for a tablet.
Get your company to contact Microsoft and get other companies to do the same. There have been other people wanting those also and they would be a great hit.