Warehouse clubs like Costco are great for stocking up on nonperishable items. But there are some things that should never be purchased in bulk.
1. Cooking oil. It has a shelf life of three to six months, according to registered dietitian Julie Brown. Therefore, that gallon bottle from Costco will probably go rancid before you can use all of it.
2. Spices. While they don’t necessarily go bad, many spices begin to lose their potency after about six months. Don’t buy more than you need.
3. Condiments. Yes, they expire — and they’re also loaded with unhealthy sugar and preservatives.
So while you should only buy certain items from the grocery store, there are still plenty of ways to save big money at warehouse clubs. Here are five things you should buy at Costco.