Amazon has the LeapFrog Learn to Write with Mr. Pencil Stylus & Writing App (works with iPhone 4/4s/5, iPod touch 4G & iPad) marked down to $7.48 from $14.99.
Keep in mind that prices flip fast on Amazon so be sure to verify the current price before purchasing!
Here’s a little about this one:
~Learn to Write with Mr. Pencil is an engaging app toy that teaches writing letters, numbers and shapes through interactive games and activities.
~The included Mr. Pencil app, Mr. Pencil stylus plus an iPhone, iPod touch or iPad work together to create a learn-to-write tool.
~This special included app helps teach letters, numbers and shapes with a unique stylus that won’t scratch device screens.
~Teaches upper- and lowercase letters, numbers 1-20 and basic shapes.