They're not custom made, but I recently bought a couple pairs of "Vibes" and "Loop" earplugs and they are easily the best <$50 purchase I've made in the last year. I prefer them to Etymotics (one of the other commonly recommended earplugs). I carry them everywhere with me and even wear them at places like restaurants to mute the noise. I can't recommend them enough.
Vibes: https://www.discovervibes.com/new-products/vibes-high-fideli...