Cafago offers the Cop Rose X6 Window Cleaning Robot for $237.83. Coupon code "ZH18246MG" drops it to $163.91. With free shipping, that's $156 off list and the lowest price we could find. It features three operating modes and includes a cleaning cloth.
Note: This item ships from mainland China and may take two to six weeks to arrive. Also, the countdown timer on the product page does not reflect an actual expiration time and resets daily.