Promo code “COUNTDOWN20” drops this certified refurbished iRobot Roomba i4+ EVO to $160, $6 under our mention from June, and the best price we’ve seen in a few months. The self-emptying base holds up to 60 days of dirt, and the i4+ carries a 20% larger battery than the Roomba i3 for longer runtime. It includes a 2-year warranty provided by Allstate and free shipping. The coupon ends October 11. Buy Now at eBay