I'm curious. Not that I have any thing against slovenia, but it isnt a country that I would have thought of moving to if I was an english speaking immigrant moving to europe.
Any ways. The usual RS, farnell, Mouser and digikey are the main suppliers in europe. there is another company that I use regularly as well, it's a polish company calle TME.EU. Not nearly as big as the old boys club, but they stock a fair amount of doo-hickys and and thingy-ma-jiggy's. And they are usually cheaper then the old boys club. Oh and you can try conrad.de, but I find them rather expensive, and I wouldnt call then a parts suppliers per say, more like selling all sorts of stuff to hobbyists, including some stuff in the EE area.
Any ways good luck.