Roborock Technology Co. Ltd via Amazon has Roborock S6 Pure Robot Vacuum and Mop with Multi-Floor Mapping for BD price $399.99 – $20 w/ promotion code ROCKS6PURE = $379.99. Shipping is free.
Roborock Technology Co. Ltd via Amazon also has Roborock E4 Mop Robot Vacuum and Mop Cleaner (Renewed) on sale for only $155.99 with code ROCKE4MOP. Shipping is free.
Note: Both of the codes will be started from 04/05/2021 12:01 AM PDT to 04/11/2020 11:59 PM PDT.