newegg offers the Klipsch Reference 12" Powered Subwoofer
, model no. RW-12d, for $279.99
with free shipping
. That's tied with our mention from two weeks ago and the lowest total price we could find by $91. It features a 340-watt RMS amplifier, 12" front-firing Cerametallic woofer, and a frequency response of 24Hz to 120Hz.