I'm a little mad to say the least about this bill. I was curious what others thought of this price? Hydro general service:Change spark plugs, oil, air filter, fuel filter,hydro filter, check and adjust carb ,tire pressure and grease. Materials used: Oil, spark plugs, air filter, oil filter, fuel filter, hydro belt, engine to deck belt and (1) spring. The machine is an Exmark Turf Tracer Walk Behind 20hp Kohler. The grand total is $465.09. What do you guys think?