Made In The USA: Comply Foam
What's more economically important, the razor, or the blades? I have two sets of what the kids call IEMs, but what we used to call "earphones", from the nice people at Noble Audio: the Noble x Massdrop and the Noble Luxe. The former is stellar, the latter ain't bad. I've discussed in the past how Noble carefully notes the source of every component in their IEMs, which is nice. So far my experience has been very good and I'm expecting long service out of both sets. The problem, however, is simple: earplugs, unlike diamonds, are not forever.
Comply makes IEM tips/earplugs/whatever you want to call them in several different shapes, densities, and colors. Compared to the original Noble foam tips, the Comply Isolation tips nontrivially improve the experience, both in comfort and in audio fidelity. In particular, the "Isolation" models restore some of the missing bass that makes me long for my Focal headphones or, better yet, my home stereo.
Comply tips are Made in the USA and they are remarkably cheap. You don't need to spring for Nobles in order to benefit; they are available for a wide variety of IEMs. If you buy some, let me know what you think.