I agree with those who said you need to MOVE FAST with Craigslist. If you are looking for something like a vintage Unisaw, those go within an hour or two of posting most of the time. It took me several tries before I got my Unisaw. I had to drive a couple of hours each way for it but it was worth it.
I used
www.craigshelper.com Very easy to use. Try to have patience in your tool pursuit. Check the list frequently every day, especially if you are seeking a high demand item (such as the aforementioned Unisaw).
Good Luck!! :)