Like @cyclops1771 said, use generics, try to order from online pharmacies (look around, there's some information out there about where you can find cheaper insulin prices) that take advantage of other countries' medicines being subsidized and such.  However, I'm trying to imagine needing 3-6 bottles of insulin a month (Even the most expensive bottles I know of are only $600, and they have very similar types of insulin-action brands for half that or cheaper.) Typical bottles have 1000 'units' of insulin. Unless he's got some serious fat boy problems as well, and has the accompanying insulin resistance associated with fat, he would likely have a insulin/carb ratio of 1unit/6grams. Even that is ridiculously low. The majority need 1 unit of insulin per 8-15 grams of carbs.  Let me break this down to show you why I'm a little mystified. 3 bottles of the expensive insulin =  3000 units of insulin. That's 100 units a day. If he's not a fatass, and not eating himself to death, I'd assume a diet/resting-rate-insulin ratio of 1-1 or 2-1. Let's assume a 1-1 ration to make it as if your friend isn't eating himself to death. That's 50 units of insulin dedicated to dealing with his diet. Assuming that worst case scenario of 1 unit of insulin to 6 grams of carbs, that means your friend is eating freaking 300 grams of carbohydrates a day! What the fuck?! Cut back on the sugar, fatass! It gets worse if we assume either the more normal 1 unit of insulin to every 8-15 grams of carbs, or a 2-1 dietary-insulin-need/resting-insulin-need.