If that's not enough to consider, it's worth noting that dollar stores aren't always cheaper than other retailers. The Washington Post points out that you need to check the size and volume of items against the price. "In general, dollar stores provide great value," says Meaghan Brophy, a senior retail analyst. "But as many items are custom-made in smaller sizes by manufacturers for dollar stores, shoppers need to compare the price against weight, length and size." For example, your box of aluminum foil might cost less at a dollar store, but contain much less foil than the box at Aldi. 

Also, it's worth noting that despite "Dollar" being in its name, the prices at Dollar General vary widely. While it may feel like you're getting a bargain no matter what you buy in the store because it sounds like an inexpensive place to shop, that isn't necessarily so. "Dollar stores are extremely convenient one-stop shopping, but if you have the time, it pays to compare prices and go where you get the best deal," says Janet Alvarez, executive editor of Wise Bread, a personal finance website.

These are all things to keep in mind the next time you need to shop.