Worst: Hummus
Unless you are going to throw a party, we cannot see why you would need to buy a Costco-sized tub of hummus. You can get a small container from a regular grocery store to avoid making food waste!
Worst: Printer Paper
If you are shopping for the office, you should get your printer paper from office supply stores instead of Costco. You will get rock-bottom prices when you visit a store such as Staples instead. The price is going to be even lower if you have good coupons and visit during the back-to-school sales.