An "affidavit" typically refers to a sworn written statement in which you state facts about which you have personal knowledge. Although your question does not indicate a purpose for the affidavit, more than likely your interests would always be best served by getting an affidavit directly from an attorney you retain. Your cost for having an attorney prepare an affidavit will (depending upon the attorney you choose) likely vary according to how involved the facts and subject matter covered by...