From the Wizard101 website:

12 Month Membership Sale!

"Do you want the full magical experience? Become a Member today and save 25% on a 12 Month Membership. As a Member you get access to ALL worlds, ranked PvP matches, ranked Pet Derby races, Castles & Lands, a larger backpack and much more! Hurry, this sale ends this Sunday at 11:59pm US Central Time. Become a Member Today "

See the Announcement here: