HiGears via Amazon offers the Ausdom M06 Bluetooth Wireless Headphones for $52.99. Coupon code "KT20AJDS" drops it to $38.99. With free shipping, that's the lowest total price we could find by $11, although they were $6 less in May. They feature a detachable 3.5mm audio cable, adjustable ear cups, rechargeable battery, leather ear cushions, and 20Hz to 20kHz frequency response.