Google's TV Streamer 4K is currently discounted for Prime Day. The same goes for Walmart's Onn 4K Pro, however, with its current price tag being about half of the Google device's, while being comparable across most metrics. https://www.notebookcheck.net/Google-TV-Streamer-4K-gets-discounted-but-unfortunately-so-does-Walmart-s-Onn-4K-Pro.1053771.0.html
While watching the promo for the Onn, the "Hey Google, dim the lights" prompt triggered my phone to try and dim the lights, even though I have voice matching turned on on my phone. Pretty harsh security issue.