Roomba maker iRobot is no longer accepting new signups for a subscription service that offers a new Roomba every three years, plus replacement parts, for $29 a month. The iRobot Select program will remain active for existing subscribers, the company confirmed, but those looking to try the service for the first time are out of luck. An iRobot spokesperson said the company closed the door to new iRobot Select subscribers in the wake of Amazon’s scuttled acquisition of the Roomba manufacturer. This news story is part of TechHive’s in-depth coverage of the best robot vacuum cleaners. “As part of i…