The Husqvarna Automower 430X, a robot lawn mower that can handle up to 0.8 acres without manual intervention, gas, or oil, is on sale for $2,153 in Amazon's Spring Sale. The robot mower can handle an acre of land with an incline and slopes up to 45% and is quiet enough to run overnight. It can be difficult to install boundary wire and may require professional help, but its blades need replacement every four to six weeks. The guide wire can be placed above or below ground, but this can break when weed-eating, causing the robot to stall until you splice the wire back together. The cost of installing the guide wire is $800, which can be recommended by Husqvarnas. The 430X can also be purchased for an $800 installation fee.