Amazon has Audio-Technica's popular ATH-M40x professional monitor headphones on sale for $79, a price drop of $20. They normally sell for close to the $100 mark and only rarely drop any lower than this; when they do, it's generally for just a few dollars more. The last time we saw them drop this low was back in June.
Can't go wrong with high-quality headphones for well under $100.
The M40x headphones offer some of the best bang-for-your-buck you can find for sub-$100 headphones. They use 40mm drivers, a circumaural design for passive noise-isolation, 90-degree swiveling ear cups for one-ear monitoring, and professional-grade material for extended comfort.
The M40x's big brother, the ATH-M50x, is also on sale right now. Those headphones are down to $129 right now from a street price around $150.
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J.D. Levite has been in the deals game since 2012. He has posted daily deals at Gizmodo, The Wirecutter, The Sweethome, and now covers deals for Android Central, iMore, and Windows Central. He was there for the first Prime Day and has braved the full force of Black Friday. If you cut him, he bleeds savings. But don't try it for real. That's a metaphor.