Groupon has the Ion Audio Piano Apprentice for Apple iPad, iPhone, and iPod touch, model no. iCK05, for $29.99 with Free Shipping for a limited time. Deal expires March 9, 2014.

This compact keyboard from Ion Audio pairs with an iPhone or iPad to teach piano fundamentals. The light-up keyboard illuminates which notes to play next in a song or scale, while the free app running on a docked Apple device shows proper hand positions and prepares you for your first gig in an old-timey saloon. It is compatible with the 30-pin iPhone, iPod touch, and iPad. iOS devices with a Lightening connector requires an adapter.