Amazon has the Roborock S5 Robotic Vacuum and Mop Cleaner for a low $394.99 with free Shipping after Coupon Code "ROBOROCKS55". I do not see tax being charged either (YMMV).
Sold by Roborock Technology Co. Ltd and Fulfilled by Amazon.
https://www.amazon.com/gp/product/B07GPH2K9P/
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