At the risk of sounding like a 15-year-old on Facebook, I must say: OMG! Unfortunately, however, this tie is still in the prototype stage and cannot yet be bought. In fact, the inventor, Bill Porter, has not indicated any plans on making a product out of this tie and selling it so it may never be available for sale… but Porter has put the source code of the tie on Github which you can use to create your own tie. Porter says it costs roughly $50 in materials.
Before you go and try to create this tie for yourself, do note currently the tie cannot be played using your phone. The ability to play via Bluetooth with a smartphone is planned for later iterations. Hit up the via link for more information, including a link for the source code.