Monoprice again offers its Monoprice Premium 5.1-Channel Home Theater Speaker System, model no. 10565, for $165.59 with free shipping. That's tied with our mention from August and the lowest total price we could find by $65. The four satellite and the center channel speakers each use a 3" mid-range driver and 3/4" dome tweeter; the powered subwoofer features an 8" down-firing speaker and 200-watt amplifier.