Aptoyu via Amazon offers its Aptoyu 20-watt Portable Wireless Bluetooth Speaker for $29.99. Coupon code "NDKWHZ7C" knocks that to $19.99. With free shipping, that's $20 off list and tied with our mention from two weeks ago as the lowest price we've seen. It features Bluetooth 4.2, a microphone, 3.5mm auxiliary input, and built-in rechargeable Li-ion battery with up to seven hours of music per charge (at 60% volume). Deal ends February 28.