HaiTeng B2C via Amazon offers the Cowin 6110 Wireless Bluetooth Portable Speaker in Black for $49.99. Coupon code "H6YBWFDP" cuts it to $39.99. With free shipping, that's the lowest price we could find by $10. It features a 20Hz to 20kHz frequency response, two 45mm drivers, Bluetooth 4.1, microphone, 3.5mm auxiliary input, TF card slot, aluminum-alloy shell, and built-in rechargeable Li-ion battery with up to 10 hours of playback per charge. Deal ends November 30.