Roborock Technology Co. Ltd via Amazon has the Prime Day Sales for the following products. Shipping is free, and authentic products in new condition from ROBOROCK TECHNOLOGY CO. LTD enjoy 1-year warranty.
Roborock S6 Pure Robot Vacuum and Mop with Multi-Floor Mapping -Black for $399.99, original price is $599.99.
Roborock S4 Robot Vacuum for $284.9, original price is $399.99.
https://www.amazon.com/dp/B084Z5P2BX/