Q: what is the cost to replace lower intake gaskets on 1999 Buick Park Avenue

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how much to replace the lower intake gaskets
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we charge about 650-700 parts and labor. it could be different in your area due to labor rates.

Figure about $600 parts and labor, give or take for your economic climate where you live. About $100 - 125 in parts, about about $400-500 in labor.
You will be draining coolant, so fresh coolant will be necessary. You will be accessing the upper radiator hose - may be a good time to replace that while you're there. Same thing with the belt and tensioner - while you're there, check those. You will need thread locker for the intake bolts on reinstallation.

That's all I can think of right now...of course doing the job, something else may be noticed and advised. Also, broken bolts and a stuck EGR tube could be a problem on removal too.
should the plenum be replaced as well I have been told that was a GM mistake on that engine.