+1 for Craigslist
The trick is not asking for too much. Many times I've seen people requesting prices greater than or equal to what you can get New from a store. What I usually do is.. before I post my listing... search for anything similar with similar specs... and determine who had the lowest price and beat it. It make take a while so you need to be patient. Someone could be interested but had to pay rent or car note with the check from the current pay period. I once had a lady told me she saw my ad but had to wait a while before contacting me.
Another good trick is to lower the price a tiny bit every week or two... You'll get it sold, eventually..
Final note... You chances of success are greatly improved if you keep the...