You need to be more specific in stating your needs. In Texas, an appraisal is performed by a state licensed or certified appraiser. Real estate agents can perform a Comparative Market Analysis or Broker Price Opinion, but cannot legally perform an appraisal. Appraisals are usually ordered by a mortgage company as part of the financing process. If you are considering making an offer, an appraisal would take more time than you probably have to prepare the offer. Your best bet would be to have your buyer agent prepare a Comparative Market Analysis. If they are unable to do this, I would find another buyer's agent.