Zenbre Direct via Amazon offers its Zenbre D5 Wireless Bluetooth Speaker in Black for $28.99. Coupon code "B4TPQICC" cuts it to $15.99. With free shipping, that's the lowest price we could find by about $25. It features a up to 40 hours of playback, Bluetooth 4.1, and 2,000mAh battery. Deal ends June 20.