If you find that one, let me know, too! I special-ordered two copies of the double-sided movie poster (framed, even), but I didn't even know there may be a poster of that particular drawing. Good luck in your search!
It's like eight years too late and maybe you've already thought of this, but you could always rent the DVD, put it in your computer, find the scene and do a screen capture, and then have it blown up to poster size.