AnkerDirect via Amazon offers the Anker SoundCore Dual-Driver Portable Bluetooth 4.0 Speakers, model no. AK-A3102011, for $39.99. Coupon code "CORE25OF" cuts it to $29.99. With free shipping, that's $10 off list and the lowest total price we could find. It features enhanced bass, 24-hour playback time, built-in microphone.