eBay with Roborock has the refurbished ROBOROCK S7 Wi-Fi Enabled Robotic Vacuum Cleaner with Sonic Mopping (Black or White) for $346 with free shipping. Comes with a 2-Year AllState warranty. Check this in-depth review.

The previous gen refurb Roborock S6 Pure Robot Vacuum and Mop w/ LiDAR is also on sale for $212 (discounted price in cart).