Anyway, since noone here in Serbia has or is using BB except few exceptions, and I will be in Viena, Austria next week, I am wondering if any Austrian here knows shop that sells accessories for BB, like cases, holsters and like that in Viena?

Yeah, there's a shop called INTERNET. Just kidding...

Yeah, I heard for that Internet thingy before
It is not that simple to order on-line something to be delivered to Serbia, and I usually like to hold something in my hands before buying it.