Official RCA and Optical cables for Chromecast Audio now available on the Google Store
Would you buy a refreshed Google Chromecast Audio? - 9to5Google
Amazon.co.jp: Optical Digital Cable Mini,CableCreation Toslink to Mini Toslink Slim Toslink Optical Digital Audio Cable Digital/SPDIF Audio Cable for Chromecast Audio, iMac, Mac Pro and More Braided Fiber Cable with Metal Connectors
Going Wireless with Google's Chromecast Audio | Sound & Vision
Google Chromecast Optical Audio Cable, TOSLINK to Mini TOSLINK Cable for TV, DVD Players, Computer, and Xbox, OEM Original : Amazon.ca: Electronics