One oddball item: Famous Dave's Signature Spicy Pickle Chips. I currently have 3 half-gallon jars. And I am one person, but let me explain ... one of my lunchtime staples is what my mother used to call "sandwich spread" which is simply any kind of meat made into a "salad" - really a spread - for sandwiches. I make my own tuna salad, chicken salad, egg salad, leftover beef/pork salad. Never have enough shrimp or salmon left to make same, but I would. Famous Dave's pickles are almost a requirement for my versions. I haven't found another pickle [including farmer's market small batch varieties) with the same sweet and spicy profile that accents these so perfectly. But, like a number of their items, Costco only buys them once a year, around Memorial Day, and then they last until they run out. I've learned that I need 3 jars to get me through until the next year. But they are good for several years. Right now I'm making up a lunch to take on a birding trip today, and I realized how much comes from Costco - the tuna (lots of cans, but they last a year too), the mayo (goes on sale every 3 months), the pickles. The celery and red onion can come from anywhere, and any extra additions - currently spinach - comes from my garden.
I also make bean salad with the pickles, but that doesn't spread so easily!