At the test facility at work, they have bins of colorful earplugs that look like this:
No they are not the big… but they are really good. As they were in bulk I never knew the brand.
But today I noticed some different packaging in the ear protection bin by our workbench area, and found these individually wrapped. Moldex Sparkplugs is the product, and that ‘random color’ is a registered trade mark.
Amazon has 200 pairs for ~$20.