AcousticSoundDesign via Amazon offers the Polk Audio PSW125 150-watt 12" Powered Subwoofer in Black or Cherry for $149 with free shipping. That's the lowest price we could find by $181, excluding other Amazon vendors. It features 150 watts continuous power, a 12" polymer composite cone driver, 30Hz to 225Hz frequency response, and line-level and speaker-level inputs.