code: def find_perf_space_price(package, size):
      
      for item in package['items']:
          if int(item['capacity']) != size:
              continue
  
          price_id = _find_price_id(item['prices'], 'performance_storage_space')
          if price_id:
              return price_id
  
      raise ValueError("Could not find performance space price for this volume")
docs: Find the price in the given package with the specified size
  
      :param package: The Performance product package
      :param size: The storage space size for which a price is desired
      :return: Returns the price for the given size, or an error if not found