" FAQ p480efs072 - USPTO "

Are there fee reductions for using EFS-Web to file a PCT Application?

The international filing fee is reduced by 100 Swiss francs for filing through EFS-Web, and 200 Swiss francs if a PCT-EASY .zip file and EFS-Web are used.

As of October 23, 2006:

USPTO FAQ - Questions and Answers (07JAN2007)