Best Buy offers the Logitech Z553 Home Theater Speaker System, model no. 980-000649, for $49.99 with free shipping. That's $15 under our October mention and the lowest total price we've seen for this model. (It's a current low by $3, although most merchants charge around $100.) It features two satellite speakers and 20-watt subwoofer.
From shoes to cookware, if you're willing to pay a little more for these awesome products, you may never have to shop for another again.