/**
  * 		This function is a singleton method used to instantiate the EEM_Attendee object
  *
  * 		@access public
  * 		@return EEM_Price_Type instance
  */
 public static function instance()
 {
     // check if instance of EEM_Price_Type already exists
     if (self::$_instance === NULL) {
         // instantiate Price_Type model
         self::$_instance = new self();
     }
     // EEM_Price_Type object
     return self::$_instance;
 }