Prime exclusive deal. Amazon has the iRobot Roomba Authentic Replenishment Kit for Series E/I/J (Black) for $30 with free shipping.

Includes: 3 High-Efficiency Filters, 3 Edge-Sweeping Brushes, and 1 Set of Dual Multi-Surface Rubber Brushes.

Compatible with: Roomba e5, Roomba e6, Roomba e7, Roomba i1, Roomba i1+, Roomba i2, Roomba i3, Roomba i3+, Roomba i4, Roomba i4+, Roomba i6, Roomba i6+, Roomba i7, Roomba i7+, Roomba i8, Roomba i8+, Roomba j6+, Roomba j7, Roomba j7+, and Roomba j8+.