World Wide Stereo offers the Infinity Primus 10" 300-watt Subwoofer, model no. PS410, for $99.95. Coupon code "HOLIDAY" drops the price to $89.95. With free shipping, that's $30 under our June mention of a refurb (this one's new) and the lowest total price we could find by $70. It features a single 10" MMD low-frequency driver and a 27Hz to 150Hz frequency response.