Amazon offers the Definitive Technology ProCinema 600 5.1-Channel Home Theater Speaker System in Black, model no. QDVA, for $360.13 with free shipping. That's $189 under our December mention and the lowest total price we've seen. (It's a current low by $179.) It includes an 8" 250-watt subwoofer, 1" dome tweeter, and features an 8-ohm impedance.