Robot vacuums that mop well rarely come cheap, but thankfully, some of our favorite models are receiving a significant discount ahead of Amazon’s next Prime Day event next week. Right now, the Ecovacs Deebot X8 Pro Omni and the newer Deebot X9 Pro Omni are on sale at Amazon for Prime members for $799.99 ($300 off) and $899.99 ($400 off), respectively, which is the lowest price we’ve seen on either model.

The Deebot X8 Pro Omni is an excellent robot vacuum and mop hybrid, with an extendable roller mop that can apply up to 4,000Pa of pressure and reach into tricky spots, including corners. The nifty roller mop can also clean itself while tidying up your home, and the vac comes with a compact multifunction dock, one that can refill the robovac using an integrated water tank and move dirty water into a separate waste tank to prevent it from dragging stains across your home.

As for vacuuming, the X8 Pro Omni boasts a powerful 18,000Pa of suction, along with a great anti-tangle brush that’s less prone to getting stuck in clutter. The hefty vac also relies on lidar and a 3D camera for mapping, allowing it to detect and avoid obstacles, adapt to various edges and baseboards, and navigate corners rather effectively. It supports Matter, too, meaning it’s compatible with voice assistants like Amazon Alexa and Google Assistant for hands-free voice control.

The newer Ecovacs Deebot X9 Pro Omni, meanwhile, is nearly identical to the X8 Pro, except it comes with some minor improvements that render it an even better cleaning machine. Although it offers slightly less powerful suction at 16,600Pa, it introduces Boosted Large-Airflow Suction Technology, which optimizes the airflow path from intake to exhaust instead of relying solely on suction power. This allows more air — and therefore more dust and debris — to move through the system, resulting in a deeper clean if you’re willing to pay $100 more.