Amazon offers Prime members the SoundLogic Bluetooth Wireless Speaker, model no. 72-15999, for $31.25 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $8.84.) That's $15 under our mention from over a year ago and the best price we've seen. (It's also a current low by $18.) This speaker can wirelessly stream audio from most Bluetooth-equipped devices and features a built-in microphone, USB charging port, and 3.5mm auxiliary jack.

Update: The price has since fallen to $30.16.