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I don't know why they didn't just add an audio jack to the normal Chromecast. Other than that aren't they identical?

Chromecast Audio was cheap and had multi-room sync. The latest Chromecast can also sync, but sends the audio over HDMI.

I also got the Chromecast audio and I also think it's great. Historically, lots of great products have been discontinued because they didn't pan out, in business terms.

I went to buy one last week. Apparently discontinued Jan 2019. I just missed the boat, and I am sad.

You can just, um, Google it :-)