Seriously, I think you're kinda barking up the wrong tree here. Or at the very least, the wrong board.
Three things you can do that I can think of off the top of my head, other than ebay:
1) Start a thread in the Buy/Sell/Trade board. http://forums.fanime.com/index.php/board,52.0.html
Maybe someone going to Fanime will be interested and would be willing to conduct the sale there.
2) It might not make much sense if you've only got the one comic to sell, but you could probably still register for a space at swap meet and try to sell it that way.
3) Stop by Lee's Comics in Mountain View. They're easy to get to from the convention. Just head north up 101 for a bit. They buy comics there.
As Firefury mentioned, any vendors in the dealers hall are much more interested in selling their own merchandise rather than picking up things themselves. Assuming they're even attending this year, there's only been one vendor that really seems to do anything with American, but I don't remember their name. More than likely you're going to be stuck holding on to it while wandering around a crowded con. Even if you've got it slabbed by CGC, I wouldn't even want to risk damaging or losing it.