I'm maybe a little older than a lot of other members. Before the 50's and into the early 60's, Drug stores were mostly Mom 'n Pop operations, although some were affiliated with Rexall or similar cooperatives. In my area, Walgreens was about the only chain store, until an Osco opened in the 60's. that was about the time the Mom 'n Pop stores started gradually fading from the scene.
The Mom 'n Pop stores usually had a section of "surgical supplies" and "rubber goods". If you wanted an enema bag, they had a bunch to choose from. If you needed a "rupture truss", a wheel chair, or similar item, they had it. "Feminine Hygiene" items consisted of maybe Kotex and Tampax in an out of the way corner.
As the chains took over and the Mom 'n Pop stores vanished, a lot of the items that the drug stores had stocked were now handled by a new type of business. It was called a "Home Medical supply" store or other similar name. I think the start of Medicare had a lot to do with that part, since the Home medical outfits were set up for insurance and Medicare billing. Most Mom 'n Pop stores were pretty much cash and carry.
About the same time, The medical profession stopped recommending enemas, rectal temperatures etc. The manufacturers stepped in with things like the "Fleet Enema". So, now the stores could sell a lot of single use items to repeat customers, instead of a good Enema bag that would last a lifetime.
So as a result, we are stuck with either a Fleet or some El-cheapo bag in the local drug store.