Valmet is a Finnish variant of the AK platform. Best bet would be to look on AKfiles.com or theakforum.net and post a WTB ad. They're quite rare so patience and $$ will be required. Hopefully they don't go for what .223 versions go for. Good luck! There's a guy in Alabama that was selling Valmet mags a month or so ago. I'll check his ad and see if he listed an M78.