Need an assist from a robot vac that will clean the floors for you? Now that the Roomba j7+ is nearly half off at Amazon, it’s the best time to get your own helper. Down from an MSRP of $800, the iRobot Roomba j7+ can be purchased for $430, lower than its Prime Day price. First of all, this robovac is super easy to set up, and mapping your home will only take a few minutes. Once that’s done, you can start sending the robot out to clean the floors, picking which rooms you want it to enter, what areas you want it to avoid, and so on. You can even schedule jobs for particular parts of the day. We…