Amazon.com has a Sony SA-WM250 100-Watt Active Subwoofer for $72.99 with Free Shipping.
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- Integrated 100-Watt amplifier n
- Video shielded construction n
- Advanced bass-reflex construction; 8-inch driver n
- Line-level and speaker-level inputs n
- Measures 11.4 x 14 x 15 inches (WxDxH