Second-hand marketplaces on the web

[vadoalfamedio]

Hi guys,
do you know if there is some BIG and RELIABLE websites in which users sell and buy second-hand gear? As you surely know, hardware synths are very expensive so I was looking for places where I can hunt some special deals...

I was wondering if there is some "classic" website (something big and referential for its market, the first place you think when you think about buying secondhand instruments!) which I didn't know. I generally use Thomann (only new stuff) but I'm very misinformed at secondhand stuff so I hope you can help me!

Thanks a lot!

[cryophonik]

Gearslutz has a secondhand classifieds forum - you must be a registered user to view it.

Vintage Synth Explorer also has a classifieds section for synths.

Sound on Sound also has a classifieds forum with a specific subforum for synths, as I recall.