Craigslist is an interesting concept, not without controversy. Craigslist premise is - you put things, anything from baseball cards to real estate or cars, from meet-up requests to job offers, into the classified list for any major metro area in the country, and you don't pay a fee. Any. Ever. It's free.
Craigslist is locally specific. You go to the site, Craigslist.org, select the location you're interested in, and then choose the ad classification you want. Posting an ad is easy, and, theoretically, there are rules and remedies that take care of spammers.
I've used Craisglist in Mississippi, Florida and Illinois. It's...