014: Bazza's Bazaar.
Bazza's Bazaar is a great resource for buying and selling movie gear. From the Bazza's web site:
"Bazza's Bazaar brokers the sale of used professional audio, film, photographic, television and video equipment of all types."
That pretty much sums it up.
Lots of their equipment is in the U.K., so the prices might be a bit high for U.S. customers. I think the sheer number of items on the well-organized Bazza's list makes up for any pricing issues.