Groupon offers the Sol Republic Master Tracks Over-the-Ear Headphones in Electro Blue, Ice White, or Vivid Red, model no. 1601-36, for $59.99 with free shipping. That's $20 under our mention from three weeks ago and the lowest total price we could find by $53. These closed-back headphones feature a frequency response of 20Hz to 20 kHz, flexible headband, and 3-button remote control. Deal ends May 15.