2. Sandwich, storage and freezer bags
We use a lot of resealable clear plastic bags in my house, so it bothers me to reach for a box at the store and not know that it’s the cheapest option that’ll do the job.
I’ve done the math on several types and sizes of these bags. Walmart’s Great Value brand always wins.
As with cereal, part of the problem with buying plastic sandwich and storage bags at Costco is that my store only carries one brand, which is a brand name: Ziploc.
Ziploc sandwich bags from my Costco, for example, cost roughly 10% more than Walmart’s Great Value version the last time I compared prices. And the price difference widens for larger and fancier bags.