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How to Find the Best Budget Robot Vacuum A bargain robotic vacuum is a bargain. Beware of the maintenance costs that might be higher than anticipated: tangles inside brushes, blocked air inlets and empty dust bins can quickly make your automatic cleaning dream into a burden. For many people the most affordable robot is the iRobot Combo. It provides the exact hands-off experience for only a fraction of the cost. Suction Power Some models in this category offer enough suction for basic vacuuming.