I have been using Proactiv for the last 15 years, you can purchase them online and the product comes every 2months on a regular schedule, but I use only 2 sets every year, so if this is the case for you, you have to stop the regular delivery by contacting their customer services. there is a new feature/option you can order whenever you need, except i have not ordered yet since last year, I would recommend it to the people with oily skin