I had a guy from Wisconsin respond to my WTB add for an EZ Flow Drop Spreader.....on CL a few years ago. He was headed to SD and offered to DELIVER the spreader.....all for the price of $75. I took him up. :)
There may be some Luck involved, but I spend a lot of time doing internet searches will on the phone with customers. Then you have to be ready to run and grab the piece before some other guy does. Or what i do is offer a few extra bucks to hold the piece and tell them to take it off the internet right away. That helps to keep anyone else from calling before you get there!