Meidong via Amazon offers the Meidong HE8C Bluetooth Headphones in Space Grey for $79.99. Coupon code "7SZ6FG54" cuts the price to $49.99. Plus, Prime members receive free shipping. That's $30 off list and the lowest price we could find. They feature a frequency range up to 120kHz and a 6-hour play time. They include S/M/L earpads and a carrying case.