Nearly everyone has price comparison shopped before. When purchasing a car, or furniture, or some other larger item, most people get out there and will find who offers the best deals. Usually the more expensive an item, the more time and energy a person puts into finding where they can save the most money. For regular everyday purchases, however, most people do not take the time to figure out which store offers the best deals. Instead we opt for wherever is the most convenient, and often end up spending way more money than necessary.
Shopping around does not make much sense when running all over the place might save a few dollars here and there. But the reason to go comparison shopping is not just one of saving money; it is also to develop better shopping habits. Much of the time when people shop they do so without a shopping list. They know vaguely what they are looking for, and then just start to grab things off the shelf that look appealing at the time. In the end, they spend way more money than they need to. And they often buy a lot of junk food with little nutritional value.
The comparison shopping list does take a little time to set up. But if you go to these stores anyways, there is no sense in not spending an extra 20 minutes writing down prices. In the end you will find that knowing the prices and knowing you are getting the best deal are comforting.
Most people will find that buying in bulk is the best way to go. Costco has the cheapest prices on many of the goods, however you have to buy larger quantities (2.5 pounds of spinach costs about half as much as other stores when calculated per pound). So if you do not have a way to store it, such as a deep freezer or a pantry, it is better to spend a little extra. Nothing will deplete your money faster than if you buy in bulk, then throw away half of it because it spoiled.