I recently subscribed to the awesomest magazine ever.
Sparkle World. I read it for the ponies, but I'm also a fan of Polly Pocket and Strawberry Shortcake. Ashleigh Ball (voice of Applejack and Rainbow Dash) and Andrea Libman (Fluttershy and Pinkie Pie) are in Strawberry Shortcake, a show on the Hub. There are posters and stickers, but the workbooks are just really easy math problems. I still got stickers!