Walmart offers the Logitech Z506 5.1-Channel Surround Sound Speaker System, model no. 980-000430, for $50.14 with free shipping. (Amazon has it for the same price exclusively for Prime members.) That's tied with our mention from last August and the lowest total price we could find now by $4. Features include 75 watts RMS power, a down-firing subwoofer, 45Hz to 20kHz frequency response, and 3.5mm audio input.