AcousticSoundDesign via eBay offers the Bic Acoustech Platinum Series 12" 250-watt Powered Subwoofer
in Black, model no. PL-200, for $259
with free shipping
. That's the lowest total price we could find by $70 and tied as the best price we've seen. It features 250-watt RMS continuous output (1,000-watt peak), 12" long-throw woofer, and 22Hz to 200Hz frequency response.