Ear plugs

At a trade stand at Phillip Island this year i bought a set of those custom made ear plugs for $60.
I quite liked them as they work every time whereas the foam ones i find can be a bit hit and miss as to wether they seal or not and i cant be bothered to pull up and fix it
anyway i lost one of them 3 rides later.
I want to replace it but i dont feel like paying $60 each time i lose one (which will no doubt happen a lot)
i found these kits out of america
http://www.earplugsthatfit.com/earplugs ... atfit.html
has anyone used them ie is it hard to do or better still does anyone know of an australian supplier of these (or similar) DIY ear plug kits
THanks
I quite liked them as they work every time whereas the foam ones i find can be a bit hit and miss as to wether they seal or not and i cant be bothered to pull up and fix it
anyway i lost one of them 3 rides later.
I want to replace it but i dont feel like paying $60 each time i lose one (which will no doubt happen a lot)
i found these kits out of america
http://www.earplugsthatfit.com/earplugs ... atfit.html
has anyone used them ie is it hard to do or better still does anyone know of an australian supplier of these (or similar) DIY ear plug kits
THanks