code: func FindPerformanceIOPSPrice(productPackage datatypes.Product_Package, size int, iops int) (datatypes.Product_Item_Price, error) {
  	for _, item := range productPackage.Items {
  		if int(*item.Capacity) != int(iops) {
  			continue
  		}
  		for _, price := range item.Prices {
  			// Only collect prices from valid location groups.
  			if price.LocationGroupId != nil {
  				continue
  			}
  			if !hasCategory(price.Categories, "performance_storage_iops") {
  				continue
  			}
  			min, err := strconv.Atoi(*price.CapacityRestrictionMinimum)
  			if err != nil {
  				return datatypes.Product_Item_Price{}, bosherr.Errorf("Unable to find price for %d iops for the given volume", iops)
  			}
  			if size < int(min) {
  				continue
  			}
  			max, err := strconv.Atoi(*price.CapacityRestrictionMaximum)
  			if err != nil {
  				return datatypes.Product_Item_Price{}, bosherr.Errorf("Unable to find price for %d iops for the given volume", iops)
  			}
  			if size > int(max) {
  				continue
  			}
  			return price, nil
  		}
  	}
  	return datatypes.Product_Item_Price{}, bosherr.Errorf("Unable to find price for %d iops for the given volume", iops)
  }
docs: // Find the price in the given package with the specified size and iops