Ralph’s is a good value supermarket. Located only in Southern California. This may seem a random thing to note but I’ve found some places can really vary in price. I’ve found Walgreens to be quite expensive and Ralph’s to be the best value for money so far, with Publix also being quite reasonable.
In the US you only get the BOGOF offers if you have a loyalty card which they scan at the till. So even if you’re only going once make sure you get one at the till to help save some money.