Hobie, don't you just order the items you actually need for the next few months, just before you actually run out?
With Roche you do. So I use two types of cannula, one with tubing and one without (as the tubing only needs renewing every 6 days, I change canns every 2 days (cos of a plethora of iffy spots, the theory being don't keep sticking cannulas in for 3 days at a time if you can help it, and thus maybe avoiding even more iffy areas of flab) - so two boxes without and one with. Come in boxes of 10 so for 3 months I would have to order 40 without and 20 with. But at the end I will have nil 'without tubing' and half a box of 'with' left.
At some stages I only actually order 'without' cos I'll have a whole box - or more - of 'with' in hand. Same with reservoirs which come in 5s. Sposed to change after 6 days but sometimes last longer and I don't die if they go over that - I mean cos I've put more insulin in (if I fill them they last at least 9 days if not longer) so I order however many, or even none sometimes when I have enough.
If I'm going away (and we often do for a few months at a time) then I'll ask for A LOT of everything before we go so if I needed to change everything more than the normal, I'd have more than enough and then if I don't need them after all, I still have em when I come home again so it can be 3, 4 or even 5 months before I need to order anything else at all.