X 3!!! Have bought and sold parts on this and on other forums and have bought parts on e-Bay as well over many years. I only accept or pay with US Postal Money Order and with one exception (bad experience with someone I trusted on this very forum where I shipped the parts before receiving payment, won't do that again)...... No problems.
And FWIW...... I never contact anyone regarding ads they may post looking for parts...... Only advertise what I have for sale. And I avoid Craig's List like the plague, as I have read of the many problems folks have had there (scammers, car jackings, armed robberies, assaults, murders, etc. when meeting with potential 'buyers').