I recently bought one from a member of this forum. I was extremely lucky, as I paid half of what I bought and sold one for about 3-4 years ago. They are extremely rare, made between 1976 and the early 80's. Both of mine were made in 1977, and were like new. The early one that I sold had the box, etc. They were probably brought in from Canada, who was doing business with Czechoslovakia during the cold war years, and US citizens could buy them there, and then pay an very high import tax ($200-$500), and bring them in without import marks. That is why there are so few in this country. They stopped making them WAY before the iron curtain fell, and we didn't start having imports until 1989 or later. Some GI's brought them back from Germany, but most of those were also 1981 or later long rails. I do not have one for sale, and just got lucky, twice. You can expect to pay $1500 to $2000 for a like new in the box short rail, from what I have seen of prices on the few I have seen outside of my own.
