Do you have the option to DIY anything to lower that cost? The engine air filter should without a doubt be something you can do on the side of the road, blindfolded, while being stung by killer bees. The oil change & filter I can see being a $100-$150 affair, if we assume they're using GOOD oil and filter, with dealer markup and labor. Diff service actually sounds plausible as well to be $100-$200, again markup of parts and labor. The tire rotation might take 15 minutes start to finish and has no consumables associated with it, and the brake fluid flush (which is a smart thing to do) is realistically another hour or so I'd say, depending on the method. I think the price adds up if that's for parts and labor, the air filter I think you could DIY for like $20 (I'm spitballing the cost of a paper filter here, but paper filters are good), which really would be inconsequential to the total cost.