Maybe it's because I personally shelled out $350 for a pair myself, but as a tech expert who's been testing gadgets for a decade, this is hands down one of the best Prime Day deals I've seen so far. The Sony WH-1000XM4 headphonesalso known by the much more readable name "Sony XM4"just plummeted to the lowest price I've ever seen. They're now just $188 at 46 percent off their original price on Amazon. Am I bitter that I paid full price? No ... definitely not.