Re: AMP... Where to look!
If I were looking for a piece of gear like that...I'd shoot Gearjonser a PM. He moves enough gear, and knows where to get it. Furthermore, he knows value and what these things are supposed to sound like, and what condition is acceptable. I'd pay him a small finders fee to hook me up.
When I start looking for my Les Paul 57 Reissue Goldtop, I'm going to give him a holler. There are still a ton of guys packing cars full of equipment and heading to LA trying to make it big. They leave a year or so later after selling all of their equipment for gas money to get back to Ohio.
That's my suggestion.