Glucose test strips $$$

It sounds like you’re asking about the marginal cost per strip—basically, how much it costs to make one more, once they’re already set up to make them. But it’s important to remember that that’s not the only cost that the manufacturer has to cover in order to break even, let alone make a profit. There are also costs involved in research and development, equipment and facilities, employee salaries and benefits, etc. that have to be covered somehow.

That said, I don’t know the answer to your question, but I did some googling. Here, for what it’s worth, are some of the things I found.

From this 2007 LA Times article. (Looks like that’s one for the “How many products use the “razor blade” business model?” thread.)

From here (January 2020)

From someone’s response on Quora