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irobot via ebay [ebay.com] has iRobot Roomba i7+ (7550) Wi-Fi Connected Self-Emptying Robot Vacuum (Refurbished) for $ 499.99 – 20% w/ code SAVEONFAVES = $ 399.99. Shipping is free.
Includes 2 yr warranty
iRobot Roomba i7+ (7550) Wi-Fi Connected Self-Emptying Robot Vacuum (Refurbished) $400 + free shipping