Amazon has iRoomba replacement parts (brushes, filters) for $18.81 after using promo code YONJEMK2 at checkout. Shipping is free.
This fits the following models: iRobot Roomba 880 860 870 871 980 990
This has a 3.8 star rating with 278 reviews.
https://www.amazon.com/dp/B01LPN0C26
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