Groupon offers the Logitech Ultimate Ears 200vi Noise-Isolating Headset 2-Pack in Blue/Grey (pictured) or Purple/Grey for $17.99 with free shipping. That's $9 per pair and the $8 under the lowest total price we could find for two of these elsewhere. These headphones feature a frequency response of 20Hz to 20kHz, in-line controls for music and phone functions, and integrated microphone. Deal ends November 22 at 1 am ET.