Shopping in bulk is a great way to save money. I like Costco, Sam's and Bj's. Different locations carry different items. I like to buy my staples like eggs, almond milk, almond flour etc from these stores. There is a lot that I didn't list that are givens (like bottled waters etc).  Sometimes these stores run out of items, so keep in mind there is more than what you see on these lists!  It is best to go and check them out, in person!  

These pictures are from Instacart App. It is a nice tool to see what is in your area. You can also use it to search particular products. I circled the store at the top of each list.