You can save $10 on Google’s 4K-ready Chromecast before it’s gone for good

If you aren’t already set up with a capable streamer to enjoy it all, the Chromecast with Google TV (4K) is on sale at Amazon, Best Buy, and the Google Store for $39.99 ($10 off), which is less than $2 shy of its all-time low. There’s a bit of urgency here, too, because we may be in the final proverbial hours of the Chromecast’s existence. Google recently confirmed it’s discontinuing the line in favor of the Google TV Streamer 4K, so if you want one — even if it’s only to…