Ketostix you should be able to get on prescription if you are diabetic. Well, at least if you are T1. Maybe not if you are T2.
I was going to ask if the blood ketone meter supplies were on prescription but from reading further above, I guess not, quid a pop. My blood ketone meter I got for free at DAFNE is sitting unused for want of strips to put in it.
I get mine off ebay. I used to snap up all the out-of-date ones at a massive discount, but Jimmy Moore has created a new market for ketosis testing, and there is a lot more competition for the strips.