You know home brew HRT vials? Those are made by folks in labs they set up in their basement. They're able to make vials for a couple dollars. The home brewers usually charge $50+ for a vial, but most of that cost is just finding a way to get it to you without revealing the identity of the seller. They have to use really elaborated and convoluted shipping/reshipping methods.
But the actual pharma companies? They have even better economies of scale. No way it's costing them more than a few dollars per vial. If random STEM nerds can do it in their homes, I'm sure they can pull it off.