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Newegg [newegg.com] has the Klipsch K-100SW 10-Inch Powered Subwoofer for $ 137 + Free Shipping

Features:
Poly-fiber woofer
Poly-fiber woofers are exceptionally light while being extremely rigid-providing remarkable low frequency response, with minimal cone breakup and distortion.
All-digital amplifier
The built-in all-digital amplifier delivers ample power with high efficiency and true-to-source accuracy in reproduction.