We buy all sorts of stuff off Craigslist and sold our old couch on it. I think we got our horse on it too. Get hay off it all the time. If there's something we need, we usually look there first because we want to avoid paying retail where possible. But then, we also live in a rural area, so sometimes it takes less time and gas to pick something up from someone's house than to go into town!
If I was shopping for something as expensive as a wedding dress, I'd look at Craigslist first. I'd figure it would be cheaper than a consignment store and I would assume I could try it on before I buy it, which you can't do with EBay.