I got 2 awesome deals from Craigslist.
The first one was a large lot of G3 ponies, which are the ones I collect. I got a ton of ponies for my collection, including the elusive Anchors Away and Thistle Whistle (scented) for $50. It was a little girl selling her collection.
The second deal was a ton of G1's - probably around 80 or so - possibly more, I can't remember - for $125 shipped. I could have driven to get them, but gas would have been more than the shipping was.
I ended up selling the G1's on ebay, and keeping most of the G3's but selling my doubles on ebay.
I have an ad up for ponies on a local recycle-type website. I have not gotten any responses, and it has been up for a few months.
I have never posted an ad on Craigslist - only responded to them.