Best Buy via eBay offers the open-box Insignia Portable Bluetooth Stereo Speaker in Black, model no. NS-SPBTBRICK-C, for $15.99 with free shipping. That's $14 off list, $9 under our January mention of a factory-sealed unit, and the lowest total price we've seen. This water-resistant Bluetooth speaker features an internal power bank for recharging your phone or other device.