How much insulin is prescribed depends on your usage and the pack size. Some people are obviously getting pre-loaded pens and some the much cheaper cartridges for the refillable ones. I'm not an insulin user, but my T1 husband is and he gets cartridges. He gets a month's supply. I get a month's supply of tablets.When I needed extra as I was going away on holiday, the receptionist , that I askeed for a repeat, checked her computer and said that I must be overusing. It was OK once I explained that I need it for a trip. Now I just let my pharmacy collect what I need. My GP health Centre is 4 miles away and the pharmacy half a mile, so I drop in when I'm passing, put in a request and pick up a few days later.