Ebay offers Refurbished iRobot Braava Jet M6 Ultimate WiFi Robot Mop for $212.49 (Reg $349.99) with free shipping.

Product Description:
When spills happen, the Braava jet m6 robot is always on call. Just say to Alexa or Google Assistant, "Have Braava mop in front of the kitchen counter", and it heads out and gets to work. Always learning your home and your cleaning habits, it can offer customized schedules that work around your life. Using Precision Jet Spray, it loosens dirt and sticky messes without spraying furniture, rugs, or walls- all without any effort from you, making your mopping tasks a thing of the past.

• USE: Efficiently mops and sweeps hardwood, tile and stone floors 
• JET SPRAY: Precision Jet Spray for treating sticky messes, grime and kitchen grease 
• DESIGN: Maximized-edge design for thorough cleaning 
• AUTOMATION: Automatically recharges and resumes cleaning 
• TECHNOLOGY: iAdapt 3.0 Navigation with vSLAM technology, ImprintTM Smart Mapping.