I wonder if any aquarium supply places might be selling it.
Aquarium supply shops often sell “fish antibiotics” which are literally just normal antibiotics from the same facilities that make prescription antibiotics, but sold cheaper, without prescription, and in bulk. They’re meant for dispersal in to aquarium systems to help fish, but a lot of people just buy them for human use. I know at least one case where someone had a literal 50 pound bag of GHG from a aquaculture supply company for a fish farm, again, without a prescription or any real oversight. So it wouldn’t be surprising if other human relevant hormones show up from such services.
Obvious disclaimer that you shouldn’t take antibiotics for minor issues and should always take a complete course, less for your own health but because doing so casually might breed antibiotic resistant strains that are supper dangerous for society as a whole.
I mean, I could handle the prices going up if wages went up in equal proportions.