A sleeper forum is the "For Sale" one at
www.homerecording.com/bbs
Since that site has a HUGE member base, you never know what you'll see there.
Another old trick is to use a search engine like
www.msn.com and
enter the name and model number of the gear you're interested in (Uh-oh giving away all my secrets!
), so you can locate more obscure sources.
Chris