I seldom sell gear, but when I do, I try Craigslist first. Why? It's local, no shipping and other costs. I meet the buyer in front of the police station where they have a spot with 24/7 cameras.

Depending on the value of the instrument, I'll choose either eBay or Reverb.

I don't do Facebook for ethical reasons but others seem to have good luck with them.

Insights and incites by Notes
_________________________
Bob "Notes" Norton smile Norton Music
http://www.nortonmusic.com

100% MIDI Super-Styles recorded by live, pro, studio musicians for a live groove
& Fake Disks for MIDI and/or RealTracks