According to the Myer Catalogue, entrants must provide a 25 word answer to the question "what you would like to transform into and why?" by Sunday the 26th of July 2009 in order to win the Lucky Draw OPtimus Prime, one of only 88 ever made.
Entries are only open to residents of Australia, and it is yet unknown whether entrants must purchase a toy from the sale to be eligible. Stay tuned to Seibertron.com for more information on this competition as it comes to hand.