Sears Tower Centerpiece?

Greetings from St.Lous! I was hoping someone can be resourceful for me today. Have you any idea how I can get my hands on a table center piece of the Sears Tower? The bigger the better! I am attending my son’s school auction at the end of February and the auction theme is academic education. Participants have an opportunity to win free “auction bucks” for the best decorated themed table, so long as it’s educational. My wife and I chose ‘Chicago’. We’ll probably display facts and figures of some stereotypical things Chicago is noted for: gangsters, skyscrapers, hotdogs, pizza etc, however we are also wanting information on intriguing obscure facts that only the locals may know about. I would really like to get my hands on a Sear Tower centerpiece if anybody knows of a place.

Thanks so much!!
Derek