Gooloo via Amazon offers its Gooloo Bluetooth 4.1 Wireless Sports Headphones for $21.99. Coupon code "EJ9KMNPK" drops it to $14.73. Plus, Prime members bag free shipping. That's tied with last month's mention, $45 off list, and the lowest price we could find. They feature Bluetooth 4.1, noise cancellation, and up to five hours of playback.