Ways round customs
Just a warning, this advice is completely illegal, I would not do it.
If the item sent form the states is a gift, then you do not need to ay tax on it, so if the package is gift wrapped, and has a birthday card attached, then customs and excise will not charge you.
If C&E can prove that it is not a gift then they coudl impound it and charge you with not payign tax, which would be bad...
Have you tried undercover paintball? Or E-bay?
You can get the nVader mask pretty cheap on ebay then all you need is a thermal lense. They aren't as comfortable, but very cheap.
Richard