I just got some plugs made by Wild Ear. Here is the link to their web-site.
http://www.wildear.com/
I don't work for them so I can give you an honest opinion. I used them this year for pheasant hunting. I heard every bird flush, but when I used my whistle or shot my gun, the noise was blocked! Amazing results, They are not as expensive as some makers, but a fine product.
The old saying "You get what you pay for" will probably apply here too.