As I said, I have never used pens and so I knew nothing about them. However, I have now read the Wikipedia article on them and I am, thus, an "expert". ;-) More seriously, I found the following remark in that article interesting.
Insulin pens are used by 95% of insulin-treated patients in Europe, Asia, Australia and Scandinavia with excellent results. They are currently underutilized but growing in use in the United States.
It's just a guess but it seems to me that if pens have that much market presence, then there should be more options open to you than one model of pen.
Also, FWIW, if you're curious about where/how Teruo gets his pens, have some other person (your mother maybe?) ask either him or his parents about this. You don't have to be the one to talk to him to find this out. Improvise. Adapt. Overcome.
The other point about Teuro which I think I was staggering in the general direction of may have been this. I'm sure there have been times recently when all you have wanted is to just be "normal" again. To not have to deal with all this. For it to just go away. To not have diabetes.
Well, whatever happened with Teuro, it sounds to me as though it is as normal as it gets. The only thing about it which seems to pertain to diabetes is possibly a (small) part of the context. Other than that it was perhaps an almost quintessentially normal part of growing up.
This may just be me, but I think somewhere the universe is smirking at you and saying, "You're welcome." Life can be a ■■■■■, but that's also normal, isn't it?
Improvise. Adapt. Overcome. (Maybe?)