Robot vacuums show up in our gift guides almost every year, and it’s easy to understand why: they clean, they save time, and they’re cheaper than hiring a professional. But not all robovacs are created equal, and some save more time than others. The Dreame X40 Ultra is one of those, offering a more genuinely hands-free cleaning experience than what you typically get. And now through December 1st, it’s down to a new low of $499.99 ($700 off) at Amazon, Best Buy, and directly from…
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