Pre-Sale Starts NOW: $100 off Gravely Mow Like A Pro Sales Event, April 27 - May 10, on the Gravely ZT 34 and 42. The ZT brings commercial features and construction to a residential compact design. This is a comfortable, durable zero-turn mower that gives you the maneuverability you need to finish the job quickly – without sacrificing a beautifully cut lawn. $479 Service Package available.