I paid $350 for my VKT three weeks ago. It was listed at $399. $465 isn't bad but not a deal either. I would try and haggle down to $400 but I would still pay the $465 if that didn't work
Check to see if the number on the bolt ball matches the serial on the barrel. The other one is alittle high, I think. $350 ish for that one.
Ask the guys over at the Gunforums. There are some real M39 gurus there.