One of the most respected sources for ahelpa in the nation, A.E. Johnson has been around since 1890. Some of their clients have included the Roosevelt and Rockefeller households probably because they are able to fill any need at all from chauffeur to governess to butler. Their website outlines exactly how much each service generally costs (Butlers can cost around 70K a year. Top butlers could even afford their own butlers!) and exactly what each service will do for you.