Is my dentist ripping me off?

I have 2 molar fillings that need to be replaced, but the dentist quoted me $2,200 to have it done. I have dental insurance, but they don't cover that much. For more detail, on the quote, they are "teeth 18 & 19, crown-porc fused to high noble, $940 each ($1880) plus $263 for cleaning. Does that seem unreasonable? Seems really high to me! How much does it normally cost to replace a filling?
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Actually for crowns those prices sound about right. And if what you need is a deep cleaning then that's not expensive at all.
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