Hi Jacob,
Your Walt Disney World Tencennial Commemorative plate from 1981 is worth roughly $150-250 dollars. Here's another one in similar condition currently up for sale:
http://www.antiquesnavigator.com/index.php?main_page=product_info&cPath=120&products_id=2591&zenid=mh04sts3cad6ce2t1fmgm5a212
They originally wanted $270 dollars for the plate but the dealer hasn't sold it yet and they are now asking $150.
WALT DISNEY WORLD TENCENNIAL COMMEMORATIVE PLATE-1981
