Amazon offers the Aomais Ball Wireless Bluetooth Portable Speaker in Black for $36.99. Coupon code "AOMAISF6" cuts that to $24.04. (Other colors are available for $25.34 after coupon.) With free shipping, that's $106 off list and the lowest price we could find. This 15-watt speaker features a IPX7 waterproof rating and Bluetooth 4.2.