Bluediocck2013 via eBay offers the Bluedio T2+ Turbine Wireless Bluetooth 4.1 Headphones in four colors for $42. In cart, they drop to $29. With free shipping, that's the lowest total price we could find by $7. They feature a folding design, 57mm drivers, 20Hz to 20kHz frequency response, 32-foot range, and about 40 hours of playback per charge.