As one of its daily deals, Anker via Amazon offers Prime members its Anker SoundCore Mini Bluetooth Speaker in Black for $18.99 with free shipping. That's a buck under our January mention (although that came with a $5 gift card) and the lowest price we could find today by $17. It features up to 15 hours of playback, Bluetooth 4.0, and a 66-foot range. Deal ends today.