I'm kind of in the same mode as Mike. A lot of the stuff I have is either guitars I built or were cheap guitars that I modified and not worth enough to sell online. Probably just donate them.
I pretty much sell everything through Ebay or Reverb. Ebay has the biggest audience, which helps if you're trying to sell something a bit unusual. Also, they have the best shipping rates/options. Their fees for stuff classified under "Musical Instruments" is less than Reverb (last time I checked). I use Reverb more for guitar sales as they're a more sophisticated audience that are more likely to recognize the value of something. What I don't like about Reverb is that it won't calculate shipping for individual buyers. So, you have to either offer free shipping, or include a cost that will cover something going cross country. I bought some of Reverb's guitar shipping boxes awhile ago, but they are so big that shipping costs are outrageous. I'm adverse to selling on Craigslist because I really don't want arbitrary people coming to my house. I don't know that I trust Facebook either.
