OK, so for various reasons (not least of which, his being an idiot) my friend backed out. He offered to buy it anyway, because he knows what it's actually worth. I told him to shove it.
So!
I put it up on my expressobeans.com account as one I'm willing to trade, and now I've got two guys offering me the Fortress of Solitude print I wanted, and I sent a PM to guy who had the Totoro print on his trade list, and this Avengers print on his want list.
This might turn out really awesome!
Edit: Of course, I could end up just getting ripped off, but hey, it's worth a shot for precious Totoro.