When it comes to getting the best deal, sometimes timing is everything. More: 6 Groceries Frugal People Buy in WinterLearn: How To Get $340 Per Year in Cash Back on Gas and Other Things You Already.
Costco is known for its great deals and even the wealthy can't resist them. A recent comparison study of Costco and Sam's Club shoppers found that Costco shoppers tend to be higher income, CNBC.