In addition to the Back to the Future set (which is, I believe, sold out now for the rest of the show), the two retail exclusives, the LEGO booth is also selling the LEGO Master Builder Academy Level 4 set 20215 Invention Designer. Priced at $79.99, not only do you get an awesome steampunk-inspired set, you'll also get an extremely limited edition lithograph by artist Derek Ring. The lithograph, which you see above, is individually signed and numbered, and limited to only 100 copies. This will be the only place where you can pick up the litho. It comes in this sturdy cardboard tube and rolled with an extra sheet of paper to protect the print.