What is cost to replace valve cover gasket and oil pan gasket?

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Had a oil change and car started leaking around valve cover gasket and also the oil pan gasket this is according to the shop where I had the oil changed at. The car has never leaked a drop before. When it first started ( day after the oil changed) it leaked a lot for a few days now just a few drops I have checked it and oil level is ok. Car does not have dip stick.