Rayo vac, I was very impressed with the db level blockage. I am not 100% sure of the actual db that is blocked but I know that with the music off, it blocked sound better than any foam plugs that I have used. If you are just looking for molded earplugs w/out the headphones in it, you can find, online at walmart, a company called radians. If I remember right they are like $15. But I know for sure that the ear fuze work well for blocking sound and allowing the music to come through nice and clear.
The Lawn Ranger
Restoring Lawn Order