iRobot Roomba Virtual Wall 1 Robotic Vacuum Replenishment Kit in the Robotic Vacuum Accessories department at Lowes.com
Best Buy: iRobot Virtual Wall Halo and Auto On Virtual Wall Black 4319194
iRobot Scooba Virtual Wall Halo Series 500/600/700 Working Condition 885155002617 | eBay
2PC Virtual Wall for Roomba - Dual Mode Barrier Mode & Halo Mode for All Models of IROBOT Roomba Cleaner - Authentic Parts (2PC) : Amazon.in: Home & Kitchen