Thanks, everyone! I finally scored this poster from an online seller AND from a theater manager near my home. I knew it would be a tough find because the posters were made for IMAX screenings, and there were only 79 theaters in the U.S. tagged by Paramount for the re-issue of "Titanic" 3-D in the IMAX format. Over the past several weeks a handful of double-sideds did turn up at eBay, almost all selling for more than $120 each. There's even an huge vinyl banner still for sale there for $75 - but that's too big for me to display. I'm good. Thanks again!