cost for replacing intake gasket on 2000 Oldsmobile Intrigue

Car slowly leaks antifreeze (DexCool); I'm told the head gasket must be replaced to the tune of $3500! Could it be the reservoir? or, intake gasket?
How much?

Asked by for the 2000 Oldsmobile Intrigue
I would let someone else check it out and even if it needed head gaskets $3500 is way to much for that job
What is the price for the parts and labor for the intake manifold gasket?