It might help to know a bit more about what you're looking for. Pre-nups in the US are generally drawn up by lawyers because of the specifics of US contract law. Getting a home-made pre-nup notarized does little or nothing for you, as in the US "notarization" is simply a means of validating the signatures of the parties to the document.
The real issue, though, is where you're likely to be when you need to use the pre-nup. If you're resident outside the US when the marriage breaks up, there is a very real chance that the country you're in won't accept the pre-nup, or won't accept specific terms of the pre-nup if they are "unconscionable" under local law.
Cheers,
Bev