The Digital Pavilion via eBay offers the ION Audio Piano Apprentice for Apple iPad, iPhone, or iPod touch for $59.99. With free shipping, it's the lowest total price we could find by $16. This Piano Apprentice allows you to use your iOS device, along with the free Piano Apprentice apps, to learn to play the piano. It features 25 light-up keys, built-in speakers, video recorder, and more. Four AA batteries are required.