Ridiculous, the seal and bearing are about $40 and it is about 2-3 hours work. Even if you put in a new axle shaft, there is no additional labor and the axle itself is only ~$400. Add the cost of new brake pads/parking brake shoes if they got oil soaked at about $100 for the entire rear axle (again, no additional labor, because they have to remove the old to get to the axle seal anyway). I will do one axle seal for $100, plus parts cost for ya.