Dell Home offers its Dell AD211 Bluetooth Portable Speaker in Black, model no. 0P31Y, for $54.99. Coupon code "EXTRA10" cuts the price to $49.49. With free shipping, that's the lowest total price we could find by $6. This 5-watt speaker features a nano coating with IPX4-rated water-resistance, 100Hz to 20kHz frequency response, two drivers tuned by Waves Audio, built-in microphone, NFC, Bluetooth 4.0, 33-foot wireless range, 3.5mm port, and rechargeable Li-ion battery with up to 10 hours of continuous audio per charge. Deal ends February 1.