I've used custom made earplugs (+/- $150,-) for about 2 years, but I found them working best if you only listen to the music and not playing it. When you play you start sweating.These things where made of some sort of hard plastic, so they would slip out of my ear a bit.
A better thing to do is using cheap foam earplugs (those little yellow ones) in combination with a very good headphone. This way you can amplify yourself +band through the headphones and get rid of the noise.
Luck,
Iwan
http://metaldrums.homestead.com
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