3 filters HEPA Roomba Series 800 900 (compatible iRobot)
iRobot Roomba e, i, j series Replenishment Kit (3-Filters, 3-Edge-Sweeping Brushes, and 1-Set of Multi-Surface Rubber Brushes) 4757964 - The Home Depot
Amazon.com - 9PACK Roomba Filters Replacement for iRobot Roomba E I & J Series i3 i3+ i4 i6 i7 i7+ i8 i8+ j7 E5 E6 Robot Vacuum Cleaners - 9 pack Roomba
5-Pack iRobot Roomba 4233 Filter - Replacement for the iRobot Roomba 400 Series Filters - Walmart.com
3 filters HEPA Roomba Series 800 900 (compatible iRobot)