Costco shows an i4 robot to compare with the i7+ on its site. The link to the actual listing for the i4 does not work though. It appears that the i4 somehow
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Get more than $250 off the highly-rated iRobot Roomba i7+ right now during Amazon Prime Day
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New iRobot® Roomba® i7+ Robot Vacuum Learns a Home's Floor Plan and Empties Itself
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