Sonic Electronix offers the NVX Bluetooth Headphones, model no. XBTL6, for $29.99 with free shipping. (Limitless Creations Direct via Amazon charges the same.) That's $100 off list and tied with our February mention as the lowest total price we could find. Features include a 20Hz to 20kHz frequency response, Bluetooth 3.0, 40mm drivers, and 32-ohm impedance.