rotors for 4x4's are cheap as hell compared to 2wd coil sprung trucks rotors since they have the hub built into them, and once you change the rotor which is like $60 alone you have to pack wheel bearings and buy a $10 dollar seal.
thats really not that bad. i usually spend about that much on rotors/pads sometimes a little more. And i know how your feeling with the whole brake job, i just did what you did not to long ago on my truck. . .and i didnt even have 90k on it then.