I used to say that patience will see you get an opportunity at every pin eventually, and for me this was true until a year ago. Now, the demand is so high, as are the prices, and I'm for the first time starting to think this is no longer the case.
Most of my machines, and all of my good deals, came from wanted ads. It's pretty competitive now though in this regard, and I get more "are you selling?" responses than machines for sale.