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 mention from two weeks ago as the lowest total price we've seen. (It's a current best by $20.) It features a frequency response of 100Hz to 20kHz, speakerphone, and carrying case. Deal ends April 9.