Meritline offers the refurbished Logitech Z623 200-watt 2.1-Channel THX-Certified Speaker System, model no. 980-000402, for $89.99. Coupon code "MLCKY03ENL1" cuts the price to $79.99. With free shipping, that's $20 below our January mention of a new model and the lowest total price we've seen. (It's a current low for a new model by $45.) It features 200 watts RMS, two satellite speakers, and a 130-watt subwoofer.
Note: No warranty information is provided.