There must have been a bunch brought in a few years ago, then no more. Thats the way it is with surplus stuff. Buy it when you see it.
BTW, I got mine through the Buy and Sell in Van. for $100 about 12 or 15 years ago. Looks unissued. In fact, I was told by someone that when Czechoslovakia switched from the original 7.62 x 45mm to the Russian 7.62 x 39 round, they built a bunch of guns, then stored them for years before dumping them.