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 $20 under our January mention and the lowest total price we've seen. (It's even $5 less than an open-box unit from a month ago, and it's a current low by $120.) It features a frequency response of 100Hz to 20kHz, speakerphone, and carrying case. Deal ends March 19.