Mambate USA via Amazon offers the Agptek Bluetooth Wireless Headphones for $29.99. Coupon code "X3V9LH5G" cuts the price to $18.99. Plus, Prime members qualify for free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, shipping costs $6.48.) That's $41 off list and the lowest total price we could find. These foldable headphones feature up to 15 hours of operation per charge and a 33-foot range.