Monoprice offers its Monoprice Premium 5.1-Channel Home Theater Speaker System for $139.99 with free shipping. That's tied with our mention from two weeks ago and the best deal we've seen. (It's also the lowest price we could find today by $50.) 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.