Newegg offers the MEElectronics Air-Fi Rumble Bluetooth Headphones with Mic in Black, model no. HP-AF80-BK-MEE, for $39.99 with free shipping. That's the lowest total price we could find by $20. They can be used wired or wirelessly and feature a 20Hz to 20KHz frequency response, 40mm drivers, 14 hours of battery life, and remote.