SOG had hirt advertised for $140/M+shipping (also charge 2% more for CC orders) in their last catalog. Usually been seeing it for $180/M lately, when you can even find it. However, SOG is notorious for listing stuff they don't really have.
One of the biggest pluses about Hirt is that it is boxer primed, and so reloadable (unlike most of the other surplus out there in this caliber). However, AK's usually ding up the brass below the shoulder pretty badly, so any extra expense may be worth it - that is, if you even reload. AIM at
www.aimsurplus.com has the port at $140/M shipped right now, which also seems to be some decent stuff, though non-reloadable.
There's also a show this weekend at the Philly national guard armory - you'll pay a few more $$$ there, but have the convenience (or inconvenience, depending on how you look at it) at walking out with it in your hands and not waiting for delivery.
Rocko