As one of its daily deals, Best Buy via eBay offers the Harman Kardon One Portable Bluetooth Speaker in Black, model no. HKONEBLKUS, for $79.99 with free shipping. That's tied with our expired mention from four days ago as the lowest total price we've seen. (It's a current low by $120.) It features a frequency response of 100Hz to 20kHz, speakerphone, and carrying case. Deal ends today.