I know they recommmend 20% protein feed for chicks, so I'm not sure if growth would be stunted by a 3% difference. Do you have access to ordering online, like chewy.com or other sites? As long as you get UPS or FedEx, you should be able to get it. How old are the chicks? If they are old enough and you supplement with other protein, make sure to give them grit to digest it.