Thanks all, and nice one, Sir Boomme. I keep going back to that and other Half Price Books in my area (it's a chain store) now, trying to find a similar deal, but I don't think that comes along too often. I did get a 1st/1st Christine that's in pretty nice shape (one small tear at the top spine of the dj) for $7 last week, so I guess that was OK...
I've always been more a reader and less a collector, so I'm starting my 1st edition collection late in the game.