A couple of months ago, we saw the Sony WH-1000XM4 drop to $129.99, which was an absolute steal for the last-gen noise-canceling headphones. That deal predictably sold out in a heartbeat, and there’s no telling whether we’ll see it that low again, but Amazon is selling them in black for $178.20 (about $170 off), which would be an all-time low if not for said outlier. You can also...