iRobot Roomba Dual Mode Virtual Wall Barrier $18 at Amazon $18 $60 Amazon has the iRobot Roomba Dual Mode Virtual Wall Barrier (Black, 4636429) on sale for $18 with free shipping on $35+ or with Prime. Compatible with Roomba 500, 600, 700, 800 and 900 Series Robots and Scooba 400 Series Robots. $18 retail: $60 Report Posted by Faraday04/29/2024 at 07:45 AM PT