Those prices are rediculous. Below is all you need. see bavauto.com or ecstuning.com There are multiple DIY's on here with pics to help you






(click to see more) Fuel Filter for X5 4.4i From Production 4/2002 Part # : 16 12 6 754 016 $ 69.95




NGK BKR6EQUP
BMW Recommended Spark Plug...
$6-$8 at autozone



2 bottles of gear oil for the diff


Mobil 1 98W573 LS 75W-90 Synthetic Gear Lube - 1 Quart

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Price:$12.76




2 bottles of dexron VI AT fluid for the transfer case



(click to see more) Automatic Transmission Fluid - ESSO LT71141 - 1 Liter For Automatic Transmission - Vehicle requires 5.5 liters Part # : ESSO LT71141 $ 21.95 ea.