Man, too bad that one didn't turn out; there were the better part of $350 worth of games there, and the cab alone wouldn't have been a bad deal for $350 with a good monitor, 4-slot, and everything else in nice shape.
I'll let ya know if I hear of anything.
In the mean time, you should join Neo-geo.com/forums and post a wanted thread on there. The guys around that site tend to be real a**holes, but you can gain a sense of what the market is like (BTW, they have a price guide for MVS carts, listed under guides on the man neo-geo.com page) and may provide some opportunities to buy a cabinet.
Best of luck!