Groupon offers the Outdoor Weather-Resistant 6.5" 80-Watt 2-Way Rock Speaker in Granite or Sandstone (pictured), model no. NX-ROCK, for $29.99 with free shipping. That's tied with our mention from three weeks ago, $60 off list and the lowest total price we could find. It features 60Hz to 20kHz frequency response and 6.5" injection-molded cone woofer. Deal ends September 19.