Knievel,
I'm in the States and went to a hearing aid place which a load of the pilots were using for the same plugs. They took a mold of my inner ear, sent them off and about 10 days later the plugs turned up.
They're a little quieter than normal - so just need to remember not to shout too much.
Here's the link for the actual entymotics product - just a matter of finding someone to create the moulds.
http://www.etymotic.com/ephp/erme.aspx