How To Connect Chromecast & Chromecast Audio To Your AV Receiver
Google says it is discontinuing the Chromecast Audio
HDMI Audio Extractor, Tiancai HDMI to HDMI and Toslink/Optical or 3.5mm Jack Audio, Compatible with Firestick, Ruku, Chromecast, Blu-ray Player, Cable Box, Home Theater etc | Walmart Canada
Chromecast Audio gains hi-res playback and multi-room support - GSMArena blog
Google Chromecast Audio Review - Does India need it?
Google discontinues Chromecast Audio, but you can grab one for $15 now - The Verge
6 Ways to Troubleshoot Chromecast Audio Issues
Hack your Chromecast to stream anything you like | Popular Science