OontZ by Cambridge SoundWorks via Amazon offers Prime members the Cambridge SoundWorks The Oontz Angle Portable Bluetooth Speaker in Black, model no. 0661799339711, for $31.98 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping adds around $6.) That's $7 under our November mention, $38 off list, and the lowest total price we've seen. It's compatible with most Bluetooth-enabled devices and features a purported rechargeable battery life of 10 hours.

Of note, it's available in silver, red, or blue for $3 more.