Best Buy via eBay offers the Harman Kardon One Portable Bluetooth Speaker
in Black, model no. HKONEBLKUS, for $49.99
with free shipping
. That's $20 under our mention from December and the lowest total price we've seen. (It's the best deal today by $40.) It features a frequency response of 100Hz to 20kHz, speakerphone, and carrying case.