Not To Be Found Anywhere!

OK, I have a challenge. Like the cookbook one.

I am trying to find a poster of a watercolor "preliminary sketch" from an Japanese anime movie, Tonari no Totoro, or, "My Neighbor Totoro," by Haayo Miyazaki. I actually own a copy of it - I bought it almost 18 years ago when I was in Japan. But I'd like to get a couple of copies of it for friends.

Unfortunately, it appears to be out of print. I have looked EVERYWHERE on the internet with no luck. There's a ton of stuff from the movie available, like stuffed animals, screen shot posters, etc. But this specific poster? Nowhere to be found!

It's a prized posession of mine, and really lovely - an early, sketchy watercolor of the smallest girl, Mei, with the 2 smaller Totoro critters in pale greens and golds. With the flood of items available from the movie, I'm amazed that this one has disappeared from circulation!