It can be cheaper to make your own breakfast sandwiches, depending on the ingredients you use. For example, if you buy bread and cheese in bulk, you'll save money compared to buying those items individually. You can also save by preparing your own eggs or using leftovers. However, it may be more expensive to buy pre-made breakfast sandwich ingredients, such as sausage or bacon. Ultimately, it's up to you to decide whether making your own breakfast sandwiches is worth the cost savings.