At that point, another shop owner was starting to open up and there was a lady outside who spoke a little English. She accompanied me inside where I showed the picture again and the owner went in to the back of the shop and came back with a 50ml bottle of Halatal. and he shook his head.
I asked for 2 bottles,
The English speaking lady explained that this was his only bottle in stock, and he might be getting another delivery in 2 days’ time. Unfortunately, most of us tourists have a very limited time in Cusco – I was leaving that afternoon – and I had to leave with my task incomplete since my intention had been to buy 2 bottles.