Sound Distributors via Amazon offers the JBL Sub 550P 10" Subwoofer with 300-watt Amplifier in Black for $169 with free shipping. That's a buck under our mention from two weeks ago and the lowest price we've seen. (It's the best deal today by $431, excluding other Amazon vendors.) It features a built-in 300-watt RMS amplifier, forward-firing 10" PolyPlas cone transducer, 27Hz to 150Hz frequency response, sealed enclosure, LFE and line-level inputs, and metal floor spikes.