Worst: Hummus
We really doubt that you need all the hummus in a Costco-sized tub unless you plan to throw a huge party. Simply get a smaller container from the traditional grocery store to prevent wasting any food.
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Worst: Printer Paper
If you do not print all that much at home or are shopping for the office, you should know that office supply stores typically boast better paper deals. You can get paper and office supplies for very low prices at Staples and similar stores as long as you have good coupons or go during a sale.