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How to Find the Best Budget Robot Vacuum A bargain robot vacuum is a great value. However, be aware that it could cost more than you expect in maintenance: detangling fur from brushes, clogged inlets, and emptying small dust bins could quickly turn your automated cleaning dream a chore. The iRobot j7 Combo is the most affordable robot for many people. It offers the same hands-free experience at less than half the price. Suction Power Some models in this category are able to handle basic vacuuming. Others may require the use of