This a rare 8-foot LEGO Rebel Attack Cruiser model was designed by LEGO Master Builder Erik Varszegi for display at Star Wars Celebration III , San Diego Comic-Con, LEGOLAND California and several other national LEGO events to promote the final episode in the Star Wars saga. This was auctioned off with a signed COA from George Lucas. The proceeds were donated to Habitat for Humanity's hurricane relief efforts in the southeastern United States. Starting bid was reported to be at $31,000.
Image source: Internet