I like having extra filters so I can use a clean one while I wash and dry the previous one. I think these are reasonable prices.
Robot vacuum cleaner Roborock S5 MAX Global, black
298 Review
iRobot Roomba 692: Smart Robot Vacuum with Wi-Fi, π€ Alexa Compatibility, and Pet-Friendly Features for Effortless Cleaning on Any Surface
138 Review
Xiaomi Mi Robot Vacuum Cleaner 1S Global Robot Vacuum Cleaner, white
389 Review
Xiaomi Mi Robot Vacuum-Mop Essential Robot Vacuum Cleaner, white
284 Review