Amazon offers its Prime members the Logitech Z313 2.1-Channel Speaker System, model no. 980-000382, for $29.74 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, shipping costs $12.74.) That's the lowest total price we could find by $5, although we saw a refurbished unit for $9 less in August. Features include 25 watts RMS of total system power, two satellite speakers, a subwoofer, wired remote, and headphone jack.