Amazon offers the Logitech Z506 5.1-Channel Surround Sound Speaker System, model no. 980-000430, for $52.99 with free shipping. That's the lowest total price we could find by $30, although we saw it for $2 less two weeks ago. Features include 75 watts RMS power, down-firing subwoofer, 45Hz to 20KHz frequency response, 3.5mm audio input, and more.