We have been on the road since early June 2018 (that is 7 months already), and visited many regions and countries (probably about 15 or more), in Europe and Africa. Every place we went, we tested our ability to buy insulin without a local prescription.
So far, our success rate for buying insulin without a prescription has been 100%, in many different places: Orkney islands, French countryside, the capitals of Hungary and Czechia, a small village in the Moroccan backcountry, a country town in Spain… The only place where I have not been able to buy without prescription (to tell the truth I have not tried) has been in the US.
Our last attempt was this past weekend. We went hiking for a long weekend in the Alpujarras mountains (lower elevation part of the original Sierra Nevada, in Andalucia). We walked by a small village where we were spending the night, and found a pharmacy that was open that evening. They had insulin, but no Novolog cartridges: we asked if he could get us some. The next morning at 10am, we picked up five 3ml-cartridges for 43.60E, that is about exactly $50.
So, for the moment, on this trip, no-prescription insulin purchases = 100% odds of success!