ProTravelGear via Groupon offers the Solitude X Noise-Canceling Headphones for $99. With $11 for shipping, it's the lowest total price we could find for these headphones by $75. They feature built-in adjustable noise cancellation, cushioned ear pads, 40mm drivers, and a 15Hz to 23,000Hz frequency response. Deal ends September 8.

Although this is listed under Groupon Chicago, it can be purchased and redeemed by anyone outside of that area.