I've got all of my machines from
http://www.superauctions.com/index.php. They haven't come by the Detroit area for going on 5 years now though. From what I understand they had some issues with paying people that had them auction their machines, so they haven't been doing as much business as they used too. It sucks even harder because the most I paid for a machine from them was $350 for my Ninja Turtles game.
Eventually my plan is to replace that PSX display with four shelving units about 5 feet high in that same kind of island pattern. But that's not going to be for a while.