No doubt about it, some birth control methods are definitely more expensive than others. The cost can be the deciding factor on whether you might use one method or another.
Total cost has to do with many factors.
But you have to keep buying them and have a supply on hand. Both periodic abstinence and withdrawal cost nothing at all to use, although you might want to pay for a class or a instructional book to learn how to do periodic abstinence the right way. Some health plans cover one method, but not another. Maybe if it's too much for you to handle alone, your partner might be willing to split the cost. Some methods seem expensive at first but might be worth the cost for the convenience.