Obviously, the most valuable information when looking at comparable sales would be the most current sale possible. A sale last week has more validity in helping you determine a purchase price than a sale from six months ago. The problem is that there is no actual record of the sales price until the transaction is completed. The information is not available in the public record because no deed has yet been recorded.
Neither is the information available in the Multiple Listing Service. Once a property is sold, it becomes a “pending sale” and all pricing information is removed from the listing. Prices are not posted until it becomes a “closed sale.” This protects the seller in case the transaction falls apart and the property is placed back on the market. It would give an unfair advantage to future potential buyers if they already knew what price the seller had been willing to accept in the past.
The listing agent can only divulge the contracted sales price if the seller agrees to allow it.