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Joybuy [joybuy.com] has Xiaomi Roborock S50 Smart Robot Vacuum Cleaner (2nd Gen) for $ 374 w/ $ 20 coupon found on the product page. Shipping is free.

Hover over "2 coupons, get them now" click "get coupon" on the $ 20 one, login/signup, and then click get coupon now.