Yeah... I was a bit surprised by that as well. I'm due for a Diff Fluid change as well. It's too cold for me to do it outside myself... and the dealer is charging 3 times as much! What to do... what to do? Should I wait it out? The dealer in my area's service department is booked solid this week anyways.
Bullock is closed Dec 17th to Jan 2nd. They must do a good biz to be able to take that kind of time off.
For an oil change, I've gone to Jiffy Lube. The filter will give them fits for a while, but they get it done. Bring your own synthetic if that is what you use b/c it expensive to buy it from them. If you use regular oil, just use theirs.