Though not a soldering gun holder, I bought one of these third hands for about $6 shipped.
What kind of PCB did you hold with those ? I want a tool like this but it always look like it can't even hold a 60% PCB .
I bought two, actually. I've never used them for holding PCB's or soldering, but to hold reflectors for photography. They're quite sturdy; the joints can be tightened and loosened to taste. While I think the arms could sustain the weight of a 60% PCB, I don't know whether the tool would sit upright without tipping over; the base may not be wide enough to support it properly.