Deathly Hallows to be exact. It's in hardcover form and wear is non-existent. Truth be told, I've never even read the damned thing. A friend invited me to the release party at Barnes and Noble, I bought a copy, and here we are years later... Only problem is I have no idea what a fair asking price would be for one of these things. I don't want to screw the buyer, but at the same time I don't want to screw myself. I'm a bit of a "rarity noob" when it comes to first, second, and so forth editions of literature.
Boy you really missed the mark on this one. Deathly Hallows had the largest first printing of all time for a book. The general principle of "first editions being worth more" won't apply here for a long time. Granted certain things can affect the price (standard or deluxe edition, ect) but right now I doubt you will get any more than you would for a used copy of any edition. Maybe in a few decades you can make a profit.
Agreed. First editions of Harry Potter books post Order of The Phoenix were printed in the hundreds of thousands. In fact, this year I saw my local discount bookshop selling off 1st ed. copies of Deathly Hallows for about a quarter of their original price. Maybe you should wait until after the movies come out, because you may get cost price back on it. Sorry.