I'm in the market for a commercial-grade mower for residential use (about 3-4 acres per week). I came across a Toro Z-Master : 21 HP Kohler With 52" deck and two extra sets of blades. The hour meter showed 294 hours. The salesman said he thought it was from '99 or 2000. A local farmer had it to cut his grass, but traded it on a larger tractor with belly mower and plow. Any idea what this is worth or where to find a value for it? They're asking $3999. Thanks for your help.