Without knowing where you live, it is hard to say how much you should pay for a crown. The prices can vary quite a bit from state to state and from city to city. Just a rough idea, crowns could be anywhere between $700 and $1500 approximately.
Call a few dental offices in your area. Some will give you a price, some may not. Before you call, make sure you know the ADA code for the crown. You could also call your insurance and ask what allowance they give for a crown.
The codes specify what kind of crown you are supposed to get on your tooth. There are quite a few options. By giving the ADA code (the letter D and four numbers - should be on your treatment plan), you will actually be able to compare the price. Without the code, once again, the quote may vary quite a bit, because of all the different types of crowns. That would comparing apples to oranges.
been working in the dental field for ages