Ending today, Groupon offers the MEElectronics Sport-Fi X6 Bluetooth Wireless Sports In-Ear Earphones in Black/Red for $19.99. Coupon code "EXTRA15" cuts that to $16.99. With $3.99 for shipping, that's the lowest total price we could find by $19. They feature 9mm drivers, sweat- and water-resistance, and a frequency response of 20Hz to 20KHz.