Great news guys! Just checked with the customer service department at Fantasy Flight Games and they have a very limited supply of Wizard tiles still available. Best of all, they ship it out to you for free.
This tile comes in the new FF edition. From the sales description:
Wizard Tile: Previously available only as a promotional item to lucky convention attendees, the powerful wizard is included in this new version of Kingdoms. This potent spellcaster is a valuable ally to any ruler; he increases the rank of adjacent castles by one, multiplying their scores.