MobileCityOnline via Amazon offers the Jarv Joggerz Pro Sports Bluetooth 4.1 Headphones in Black/Grey or Black/Green, model no. BT501-BLK, for $39.99. Coupon code "6F4JFJ73" cuts it to $19.99. With free shipping, that's the lowest total price we could find by $5. They feature a frequency response of 30Hz to 15kHz, in-line mic and controls, and a built-in, rechargeable battery.