I have seen a total of 2 in the last 5 years...and i owned both of them.
the first was a gun i had traded for about 5 years ago. nice rifle, but not especially accurate. did not seem to like any 100 grain loads, so i wondered how they had twisted the barrel. traded it off after a while, although a nice light gun i could not get it to shoot better than about 2 1/2 inches with any load. never did find any problems with bedding, etc, so finally moved it out.
last year while at the big Tulsa gun show, i found another, a guy was walking around with it, like new with box, and topped with a 4x Weaver. i gave him $450 for it, and it shot like crazy, especially with the 100 grain Winchester factory silvertip loads. averages about an inch or so at 100.
it also had better wood than the first and i wont ever part with it.
i see a few of the carbines now & then, mostly in .308, and 1 in .22-250, but have only seen 2 .250's total. I am lucky in that both the April & October gun show here average 4500+ tables, and i keep an eye out for the carbines. been thinking of trying to find one in another caliber, if i see one i will drop you a PM.