Well...
You have an ad here, and I think the user "Han" has a copy but you had left the chat when he replied to your question there.
Also, the website tradera.se is Ebay, but in Swedish, perhaps you can find a copy there.
I am a bit curious as to why you want an early edition of Western though. The mechanics are a bit... unwieldy and slow... (Actually they make Rolemaster seem like a simple lightweight indie game in comparison.) I don't know any gamers these days that prefer the first edition over the newer.
The setting stuff is pretty good, but if you are looking for such info there must be better sources available in English or whatever other language you prefer.