This appears to be the last generation model (i.e. 10 years old) and not the newer (5 years old) 500 series.
The last generation goes near or below $100 once or twice a year. This is not a good price although it does comes with 2 virtual walls.
I have two of these and both of them went bad after 1-2 years and will not charge the battery. The battery still holds a charge. It is the charging circuit inside the roomba that is bad.
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