Avantree Direct via Amazon offers the Avantree Torpedo Portable Bluetooth 4.0 Speaker in Black, model no. BTSP-006-BLK, for $54.99. Coupon code "7EVFCCN5" cuts the price to $38.99. With free shipping, that's $61 off list and the lowest total price we could find. It features two 5-watt speakers and a six-hour operation time.