As far as I can find, DSC makes this inconvenient. You would need to cancel your plan and start a new one again every other month, which is a hassle. Yes, you save money, but if you want to go for the cheapest route possible you should just order 2-blade Bic razors on amazon, which could be more than half a year of shaving for $11.37 for a less frequent shaver. The point of the exercise is to see which automated plans are better, not to find the cheapest possible shaving route.