Do you live in Helsinki or close by? In Helsinki (or you can just order online) there's at least this shop for electronics that I know of: http://www.partco.biz/verkkokauppa/index.php?language=en .

As soon as someone finds a way to replace the pencil mod with resistor or something (and/or when wolfey2014 reveals the new, better mod), I think I'll try to mod one of my gridseeds as well (and then the rest if I don't brick that one..