Ben
You could also just luck onto one like I did recently. I advertised for a Brno Zkk602 with a popup peep and a guy rang me to see if I wanted to buy his Zkk600 in 7x57 with popup peep. Price was right for both of us so now it is on it's way.
Btw I also got the 602 and a spare popup peep.
There is a lot of stuff just sitting out there in safes not being used. For every one of us saying I wish I had this gun there is someone out there with it who would probably sell it at a reasonable price - within reason anyway. Food for thought.
Rick