'Price' in the Bible

Then David said to Ornan, “Give me the site of this threshing floor, that I may build on it an altar to the Lord; for the full price you shall give it to me, that the plague may be restrained from the people.”

But King David said to Ornan, “No, but I will surely buy it for the full price; for I will not take what is yours for the Lord, or offer a burnt offering which costs me nothing.”