NewEgg.com has the Polk Audio PSW10 Black 50-watt Powered Subwoofer for $90 with free shipping.
Built-in High Current Amplifier supplies all the good, clean power you need
Adjustable Low-Pass Crossover, Phase Switch and Subwoofer Volume Control
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Not capable of shaking the house, but a good addition for many TIB systems.
I was disappointed with mine since it was rated on CNET. I agree with #1