I’d check your Yellow Pages for actual medical supply places. My mother has one (she is a nurse), so I know they are procure-able!

I’m a bit shocked Walgreens didn’t have them, but if there are any other pharmacies in your area they might be worth a check.

I bet Meijers has them (it’s an everything and the kitchen sink too kinda place) but that is contingent on living in Midwest USA.

Are you anywhere near a body of water? Anywhere that sells supplies for fly fishing is worth checking. Hobby shops too, like the kind where they have like model trains and airplanes and whut.

… that’s everything I could think of, sorry. Hopefully you haven’t already tried all of them!