Spotify's desktop app adds support for Chromecast - 9to5Google
Jensen Portable Bluetooth Speaker, Black, JSB-1000 - Walmart.com
Amazon.com: WiiM Pro AirPlay 2 Receiver, Chromecast Audio, WiFi Multiroom Streamer, Compatible with Alexa, Siri and Google Assistant, Stream Hi-Res Audio from Spotify, Amazon Music, Tidal and More : Electronics
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AudioCast M5 is a ChromeCast Audio Alternative with Local Audio Files and Multi-Room Support - CNX Software