This shouldn't be related to export rules. I think it is just a limitation on Symantec's North America web store. I do not know if/when a Europe-based store will carry PGP products but I certainly expect and hope that will happen.
There are a number of Symantec resellers in Switzerland who provide the Encryption (PGP) products:
http://partnerlocator.symantec.com/public/search;locale=en-us;specialization=826;country=Switzerland;v=advanced_results;proximity=25/