Is there an Audiogon for musical instruments?

I've gotten the bug to buy a Martin Guitar and I wonder if there is a marketplace similar to Audiogon for such a commodity.
Try net instruments or do a search for used geetars

Happy Playing.
If there isn't, does it give you any ideas?
Try the following link:

I've bought and sold a fair amount of musical instrument gear there over the past 9 years.

Good luck.
I am a Strat and 335 kinda guy, but I believe you can, at least, learn a lot at
e-bay advertises a lot of Martins
Not sure what you six-stringers do, but for us bass players, there are TalkBass.Com (fantastic site) and