Real Close Price of New Home?

[Sean Tong]

Hello, I am planning to purchase a new construction house in St Johns county FL. I know the builder has been giving out incentives, but how do I find the actual price that the previous buyers actually paid? I checked the county recorder and appraiser site, but all they have is just a Deed with the Sales Purchase price. There is no breakdown of incentives. I asked around the Title office and seems like the public record sale price is Excluded of incentives. 

Thank You