It may depend on where you live. I am pretty certain that I need a prescription for a glucagon kit. Which will add $9 to $15 dollars to the overall cost. Just to be sure that my insurer will reimburse the expense.
We live in Canada and I can walk into any pharmacy and ask for a vial of novorapid, syringes, test strips and lancets without prescription and I do. I never order under prescription for these items to avoid the $9 to $15, added, prescription fee, and the pharmacy is required to provide me with a receipt that I am able to forward on to my insurer. As for pump supplies, I order directly from the manufacturer as a three month standing supply so that I get a 15% discount for the standing order and I have never provided a prescription for it yet.
My understanding is that in an emergency, my son can walk in to any pharmacy in Ontario, where we live, tell them that he is a diabetic and in need of a syringe with so many units of insulin and be given it, without cost, by providing ID and his Ontario health card.