I also need to sell my Google Chromecast with Google TV 4K. Brand new, still in its shrink wrap. Bought it last year, to replace a flaky Roku. It was a flaky HDMI cable instead. I trust Roku more than Google for hardware support.
I genuinely thought all the chromecast audios I owned were useless bricks and was looking around for replacements and then they just started working again from an OTA update. Astounding. I assume someone got fired for taking time away from making search worse to do this.
(edit: https://www.techradar.com/televisions/streaming-devices/goog...)
Of course another question how long they will honor that commitment.