JBL offers its JBL 400-watt 12" Powered Subwoofer, model no ES250P, for $199.95 with free shipping. (Amazon charges the same.) That's $349 off list and the lowest total price we could find. It features a 12" proprietary PolyPlas-cone woofer, 25Hz to 150Hz frequency response, and 700 watts of peak power handling.