Amazon.com - iRobot Roomba Authentic Replacement Parts - Roomba 800 and 900 Series Replenishment Kit (3 AeroForce Filters, 2 Spinning Side Brushes, and 1 Set of Multi-Surface Rubber Brushes)
iRobot Roomba 800 Series Repair - iFixit
Amazon.com: 3-Pack Replacement Side Brush Compatible with IRobots Roomba 800 and 900 Series & 600 Series 877 891 895 761 770 780 790 614 665 671 675 690 670 Models - 4636428 (A) : Home & Kitchen