Are you able to shop or travel in other countries of the former Yugoslavia these days? Efke is producing sheet film, so I would think there must be some domestic market, however small. Maybe you could get some hints from Mirko at www.fotoimpex.de. They handle export and sales of various East European films and photo products (Efke, Forte, Meopta, Orwo, etc.), and I would guess that they might be able to point you to some local sources for used equipment.