code: func FindPerformanceSpacePrice(productPackage datatypes.Product_Package, size int) (datatypes.Product_Item_Price, error) {
  	for _, item := range productPackage.Items {
  		if int(*item.Capacity) != size {
  			continue
  		}
  		for _, price := range item.Prices {
  			// Only collect prices from valid location groups.
  			if price.LocationGroupId != nil {
  				continue
  			}
  			if !hasCategory(price.Categories, "performance_storage_space") {
  				continue
  			}
  			return price, nil
  		}
  	}
  	return datatypes.Product_Item_Price{}, bosherr.Errorf("Unable to find disk space price with size of %d for the given volume", size)
  }
docs: // Find the price in the given package with the specified size