code: func FindPerformancePrice(productPackage datatypes.Product_Package, priceCategory string) (datatypes.Product_Item_Price, error) {
  	for _, item := range productPackage.Items {
  		for _, price := range item.Prices {
  			// Only collect prices from valid location groups.
  			if price.LocationGroupId != nil {
  				continue
  			}
  			if !hasCategory(price.Categories, priceCategory) {
  				continue
  			}
  			return price, nil
  		}
  	}
  	return datatypes.Product_Item_Price{}, bosherr.Error("Unable to find price for performance storage")
  }
docs: // Find the price in the given package that has the specified category