I found blanks at American Lock and Key, here in LaCrosse but they had to be ordered and cost was about 20 bucks a piece, decided against it ...hope this helps.

Are you in Washington state? I also have an 87' GTI with similar key issues. I believe there is an ignition key option that can be used from a VW Type2? Not 100% sure. The current key set up is more of the Italian ignition key and a traditional VW door key.