Roborock Technology Co. Ltd. via Amazon has Roborock S5 Robotic Vacuum and Mop Cleaner (Renewed) on sale for $280 when you clip the coupon on product page. Shipping is free.
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Roborock Technology Co. Ltd. via Amazon also has Roborock E2 Robot Vacuum Cleaner (Renewed) on sale for $139.99 when you clip the coupon on product page. Shipping is free.
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Note: All the coupons will be available from 11/07/2019 to 11/10/2019.