Amazon is acquiring iRobot for $61 a share in an all-cash deal that values the Roomba maker at $1.7 billion, the companies announced Friday. The deal will deepen Amazon's presence in consumer robotics. Amazon made a bold bet on the space last year when it unveiled the Astro home robot, a $1,449.99 device that's equipped with the company's Alexa digital assistant and can follow consumers around the