Logitech offers the factory-refurbished Logitech Z506 5.1-Channel Surround Sound Speaker System, model no. 980-000430, for $99.99. Coupon code "logi_z506_71911" drops it to $54.99. With free shipping, that's the lowest total price we could find by $25. (We mentioned a new but dented-box unit for the same price last month.) Features include 75 watts RMS of total power, down-firing subwoofer, 45Hz to 20KHz frequency response, 3.5mm audio input, and more. A 90-day Logitech warranty applies. Offer ends July 22.