eCase via Amazon offers the Kmashi Arma K1 Rugged Bluetooth 4.0 Wireless Speaker for $36.99. Coupon code "KMASHIK1" drops it to $21.99. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $5.85.) That's tied with our mention from last month as the lowest total price we've seen. (It's a current low by $8.) This speaker also functions as a charger and features a waterproof design, 4,800mAh battery providing up to 35 hours of playback time, 3-mode LED flashlight, and Bluetooth 4.0 wireless range of up to 33 feet.

Orders placed by today, December 22, are guaranteed to arrive in time for Christmas via Prime shipping; otherwise, upgrade to 2-day shipping by today for $12.13 for guaranteed delivery.