19-4 he's asking $345. and for the 66-2 he's asking $729.
For $345, I certainly would not have waited for internet approval to have purchased that 19-4. What frequently seems to happen, is by the time you post the question and finally make the decision, the gun is gone.
I paid $700 for a 19-2 last year, mine was NIB and came with the paperwork, SAT and cleaning tools, still sealed in the plastic bag. I feel that I got a OK deal, but certainly not as good as one for half that price.