What is a reasonable cost for 100,000 mile maintenance? on 2002 Buick Park Avenue

I got an estimate of around $900 to get everything done. Is this reasonable?

Asked by for the 2002 Buick Park Avenue
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need a list to answer this
INT MANIFOLD SET / Intake Manifold Gaskets
MS98014T 1.00 125.54 125.54
UPPER MANIFOLD SET / Fuel Inj Plenum Gasket
MS95812 1.00 99.18 99.18
SPARK PLUG ASM / Spark Plug
41-601 6.00 5.89 35.34
WIRE KIT,SPLG / Spark Plug Wires, Set
746DD 1.00 91.85 91.85
COOLANT GLOBAL
10-101 2.00 19.95 39.90
Shop Supplies/Disposal** 30.87
INTAKE MANIFOLD GASKET- REMOVE & 441.00
REPLACE
Normally Aspirated Manifold,Lower , FUEL
INJECTION - GAS, MFI
**** Taxes ****
<Sales Tax $60.46>
Parts: 422.68 Labor: 441.00 Tax: 60.46 Total : $ 924.14