iRobot's Roomba 694 robot vacuum drops back to $179
iRobot Roomba 980 review: You'll pay a premium for this smart but unexceptional vacuum bot - CNET
iRobot's Popular Roomba Vacuums are the Cheapest Ever on Amazon
iRobot Roomba 581 Robot Vacuum Cleaner 3D model - Electronics on Hum3D
Refurbished: iRobot Roomba i7+ (7550) Robot Vacuum with Automatic Dirt Disposal - Empties Itself for up to 60 Days, Wi-Fi Connected, Smart Mapping, Works with Alexa, Ideal for Pet Hair, Carpets, Hard
iRobot Create® 3 Programmable Robot : ID 5424 : $449.99 : Adafruit Industries, Unique & fun DIY electronics and kits