Surefire plugs are very cheap $15 and work great as stand alone or under muffs.
You can Google "custom earplugs" and there's a ton of mail order places that can get you that custom look plugs. There's always someone at gunshows making them. Audiologists also can make you some, but they'll be expensive. I had some racing plugs made professionally and they were expensive. My Surefires work just as well.