Newegg offers the Polk Audio PSW505 300-watt 12" Powered Subwoofer model no. PSW505, in Black for $199.95. Apply coupon code "VCO" and checkout with Visa Checkout to cut it to $179.95. With free shipping that's $20 below our June mention and the lowest total price we could find by $40. It features a frequency response of 23Hz to 160Hz, automatic on/off switch, magnetic shielding, adjustable crossover, phase switch, volume control, and more. Deal ends August 25.