Walmart offers the Shark Ion Robot 700 Vacuum for $169.99 with free shipping. That's $99 under our mention from last December, $129 off list, and the best price we could find. (For further comparison, it's $27 under the lowest price we could find fora refurb elsewhere.) It features a scheduling remote, self-cleaning brushroll, and proximity sensors.
Looking for a good deal on a set of wheels? This should be your first stop.