Shark robot vacuums are on sale for Prime Day and there are some good deals to be had. For instance, the AI Ultra is on sale for just $298. This is 50 percent off, as the regular price is $599. This is a version of the model topped our list of the best robot vacuums, so it's the real deal. The AI Ultra boasts fantastic suction power and the bagless self-emptying base is incredibly handy. There's a simple mobile app that lets users control the vacuum when not at home. This app also displays home maps made by the vacuum that can be edited to create "no-go" zones. The battery life is decent, at...

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