Personally, I spend $40 or so and get 500 disposable earplugs, and use each pair until they don’t work well any more, then throw them out. (For riding my motorcycle, sleeping, sometimes shooting; I wear Etymotic earplugs for concerts.) Is it a little wasteful? Sure. But it will take me years to spend as much on disposables and molded ear plugs would cost. I’ve tried the DIY molded ear plugs, and found that they were less effective than disposable foam earplugs for blocking noise.
What are you doing, and why do you want them?
Personally, I spend $40 or so and get 500 disposable earplugs, and use each pair until they don’t work well any more, then throw them out. (For riding my motorcycle, sleeping, sometimes shooting; I wear Etymotic earplugs for concerts.) Is it a little wasteful? Sure. But it will take me years to spend as much on disposables and molded ear plugs would cost. I’ve tried the DIY molded ear plugs, and found that they were less effective than disposable foam earplugs for blocking noise.