Yes, when my daughter first started pumping, we couldn't get infusion sets to stick to her. Until we found flexifix tape, she used an average of one a day. It was nuts, so we got a prescription for daily changes in order to have a cushion - that's 9 boxes of infusion sets every three months. Now, once we figured out how to make them stick, we just worked through the ones we had, not reordering until we got down to a couple of boxes. Same thing with the t:slim cartridges. I don't think I've ordered any in the year 2014 (although a cartridge used to last her a week, now it's about 4 days, so we are going through them).