Perhaps you can contact the agents who had the listings and ask for the number of the appraisers, but there is no guarantee they will give you any information. They may be more apt to giving a Realtor this information. Let me know if you need further assistance in acquiring any information. Do you have a property to sell. I look forward to your call.
Tax assessments are public record. Your county tax assessor's office would have the most recent tax assessment for a property. Many jurisdictions have the information online, so you can research it (at no charge) from your own computer.
Hope that helps.