If vacuuming is one of your least favorite household chores, a robot vacuum can be a blessing. New models from iRobot and Shark have become more powerful and less expensive. iRobot's models are currently on sale on Amazon, so it helps when they go on sale. One of our favorite budget picks has been discounted by the retailer. The robot vacuum is discounted by 35 percent. If you want a no frills option, the 694 is a good choice. The companion app allows you to connect to it through the internet. It's easy to set up a vacuuming schedule with the software. If you add a powerful motor and good battery life, you have a robot vacuum that will meet the needs of most people. The 694 doesn't come with spare parts so you'll have to pay more when you need a replacement. It is less of a concern when you save almost $100 off the usual price. The j7+ and s9+ have been discounted by Amazon. After a $200 price cut, the former is $599 and the latter is $799. The j7+ is the best choice for most people. It has a computer vision software that makes the vacuum better at avoiding obstacles. The s9+ isn't as smart as the newer sibling, but it's 40 times more powerful. If you have a lot of carpet in your home, the s9+ will leave your floors cleaner than the company's other vacuumrobots. Both models have docking stations where they can empty their canisters at the end of a cleaning session. You don't need to upgrade to the s9+ if you want that feature. The latest tech deals and buying advice can be found in the Engadget Deals Newsletter.