Because protein supplements include so many different categories, you can purchase them from a wide variety of retailers. Some of the most common places to buy health supplements include: Grocery Stores: Most grocery stores have a selection of protein bars, and some also carry protein drinks. Convenience Stores: You can typically order protein bars and drinks from convenience stores, but the selection may be limited. Warehouse Clubs: Many warehouse clubs sell large quantities of protein supplements so you can stock up for longer-term needs. Specialty Stores: Select specialty stores, such as health stores and supplement shops, sell an extensive range of protein-packed options. You can browse the largest selection of bars, drinks, and powders here. No matter where you prefer to purchase your protein supplements, you can order via Instacart. That way, you can make your day easier and get your favorite protein supplements delivered right to your door.