Amazon.com has a Yamaha YST-SW215 8″ Powered Subwoofer for $93.99 with Free Shipping.
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- Measures 11-7/16 by 14-3/16 by 12-7/16 inches (width by height by depth) n
- 8-inch cone driver and built-in 120-watt amplifier n
- Down firing driver radiates sound in all directions n
- YST Active Servo Technology for expanded base response n
- 30 to 200 Hz response, plus line level and speaker level inputs