Etymotics are the brand I have. They ran me about $125 or so. They are similar to the foam earplugs. The piece that goes in your ear is foam with a canal through the middle for sound. They not only block out noise they sound awsome!! I've heard shit in Pink Floyd I've never heard before. They were one of the best purchases I've made in a long time. I've owned them for about 4 yrs and never had a problem. here is a link
Etymotic Research, Inc. - ER•6i Isolator Earphones