Jed is right. Prior sales price will not be helpful. The county records in his location must be more inclusive than they are in most places though, because that info is generally available only through MLS records. If you do not already have a buyer's agency agreement with a REALTOR member of the MLS, you should.
Why? If you think knowing the previous sales price matters it doesn't. Also the information is public and can be found at the county recorders office or you can ask a Realtor to look it up for you. It is a toll we have access to te be sure that the person selling is the person that has title.