Harman Audio offers its refurbished Harman Kardon HKTS 15 5.1-Channel Home Theater Speaker System for $139.99 with free shipping. That's $10 under our mention of a new one from March and the lowest price we've seen for this set in any condition. (It's $100 below the best deal we could find for a new one today.) It features a frequency response of 35Hz to 20kHz, four satellite speakers with 1/2" dome tweeters and 3" drivers, center-channel speaker with 3/4" dome tweeter and dual 3" drivers, 10" 100-watt powered subwoofer, speaker cables, and four shelf stands and wall mount brackets.
Note: A 1-year Harman Kardon warranty applies.